Update deps

vendor/github.com/ettle/strcase/doc.go

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+/*
+Package strcase is a package for converting strings into various word cases
+(e.g. snake_case, camelCase)
+
+ go get -u github.com/ettle/strcase
+
+Example usage
+
+ strcase.ToSnake("Hello World")     // hello_world
+ strcase.ToSNAKE("Hello World")     // HELLO_WORLD
+
+ strcase.ToKebab("helloWorld")      // hello-world
+ strcase.ToKEBAB("helloWorld")      // HELLO-WORLD
+
+ strcase.ToPascal("hello-world")    // HelloWorld
+ strcase.ToCamel("hello-world")     // helloWorld
+
+ // Handle odd cases
+ strcase.ToSnake("FOOBar")          // foo_bar
+
+ // Support Go initialisms
+ strcase.ToGoPascal("http_response") // HTTPResponse
+
+ // Specify case and delimiter
+ strcase.ToCase("HelloWorld", strcase.UpperCase, '.') // HELLO.WORLD
+
+Why this package
+
+String strcase is pretty straight forward and there are a number of methods to
+do it. This package is fully featured, more customizable, better tested, and
+faster* than other packages and what you would probably whip up yourself.
+
+Unicode support
+
+We work for with unicode strings and pay very little performance penalty for it
+as we optimized for the common use case of ASCII only strings.
+
+Customization
+
+You can create a custom caser that changes the behavior to what you want. This
+customization also reduces the pressure for us to change the default behavior
+which means that things are more stable for everyone involved.  The goal is to
+make the common path easy and fast, while making the uncommon path possible.
+
+ c := NewCaser(
+	// Use Go's default initialisms e.g. ID, HTML
+ 	true,
+	// Override initialisms (e.g. don't initialize HTML but initialize SSL
+ 	map[string]bool{"SSL": true, "HTML": false},
+	// Write your own custom SplitFn
+	//
+ 	NewSplitFn(
+ 		[]rune{'*', '.', ','},
+ 		SplitCase,
+ 		SplitAcronym,
+ 		PreserveNumberFormatting,
+ 		SplitBeforeNumber,
+ 		SplitAfterNumber,
+ 	))
+ assert.Equal(t, "http_200", c.ToSnake("http200"))
+
+Initialism support
+
+By default, we use the golint intialisms list. You can customize and override
+the initialisms if you wish to add additional ones, such as "SSL" or "CMS" or
+domain specific ones to your industry.
+
+  ToGoPascal("http_response") // HTTPResponse
+  ToGoSnake("http_response") // HTTP_response
+
+Test coverage
+
+We have a wide ranging test suite to make sure that we understand our behavior.
+Test coverage isn't everything, but we aim for 100% coverage.
+
+Fast
+
+Optimized to reduce memory allocations with Builder. Benchmarked and optimized
+around common cases.
+
+We're on par with the fastest packages (that have less features) and much
+faster than others. We also benchmarked against code snippets. Using string
+builders to reduce memory allocation and reordering boolean checks for the
+common cases have a large performance impact.
+
+Hopefully I was fair to each library and happy to rerun benchmarks differently
+or reword my commentary based on suggestions or updates.
+
+  // This package - faster then almost all libraries
+  // Initialisms are more complicated and slightly slower, but still faster then other libraries that do less
+  BenchmarkToTitle-4                       7821166               221 ns/op              32 B/op          1 allocs/op
+  BenchmarkToSnake-4                       9378589               202 ns/op              32 B/op          1 allocs/op
+  BenchmarkToSNAKE-4                       6174453               223 ns/op              32 B/op          1 allocs/op
+  BenchmarkToGoSnake-4                     3114266               434 ns/op              44 B/op          4 allocs/op
+  BenchmarkToCustomCaser-4                 2973855               448 ns/op              56 B/op          4 allocs/op
+
+  // Segment has very fast snake case and camel case libraries
+  // No features or customization, but very very fast
+  BenchmarkSegment-4                      24003495                64.9 ns/op            16 B/op          1 allocs/op
+
+  // Stdlib strings.Title for comparison, even though it only splits on spaces
+  BenchmarkToTitleStrings-4               11259376               161 ns/op              16 B/op          1 allocs/op
+
+  // Other libraries or code snippets
+  // - Most are slower, by up to an order of magnitude
+  // - None support initialisms or customization
+  // - Some generate only camelCase or snake_case
+  // - Many lack unicode support
+  BenchmarkToSnakeStoewer-4                7103268               297 ns/op              64 B/op          2 allocs/op
+  // Copying small rune arrays is slow
+  BenchmarkToSnakeSiongui-4                3710768               413 ns/op              48 B/op         10 allocs/op
+  BenchmarkGoValidator-4                   2416479              1049 ns/op             184 B/op          9 allocs/op
+  // String alloction is slow
+  BenchmarkToSnakeFatih-4                  1000000              2407 ns/op             624 B/op         26 allocs/op
+  BenchmarkToSnakeIanColeman-4             1005766              1426 ns/op             160 B/op         13 allocs/op
+  // Regexp is slow
+  BenchmarkToSnakeGolangPrograms-4          614689              2237 ns/op             225 B/op         11 allocs/op
+
+
+
+  // These results aren't a surprise - my initial version of this library was
+  // painfully slow. I think most of us, without spending some time with
+  // profilers and benchmarks, would write also something on the slower side.
+
+
+Why not this package
+
+If every nanosecond matters and this is used in a tight loop, use segment.io's
+libraries (https://github.com/segmentio/go-snakecase and
+https://github.com/segmentio/go-camelcase). They lack features, but make up for
+it by being blazing fast. Alternatively, if you need your code to work slightly
+differently, fork them and tailor it for your use case.
+
+If you don't like having external imports, I get it. This package only imports
+packages for testing, otherwise it only uses the standard library. If that's
+not enough, you can use this repo as the foundation for your own. MIT Licensed.
+
+This package is still relatively new and while I've used it for a while
+personally, it doesn't have the miles that other packages do. I've tested this
+code agains't their test cases to make sure that there aren't any surprises.
+
+Migrating from other packages
+
+If you are migrating from from another package, you may find slight differences
+in output. To reduce the delta, you may find it helpful to use the following
+custom casers to mimic the behavior of the other package.
+
+  // From https://github.com/iancoleman/strcase
+  var c = NewCaser(false, nil, NewSplitFn([]rune{'_', '-', '.'}, SplitCase, SplitAcronym, SplitBeforeNumber))
+
+  // From https://github.com/stoewer/go-strcase
+  var c = NewCaser(false, nil, NewSplitFn([]rune{'_', '-'}, SplitCase), SplitAcronym)
+
+*/
+package strcase