Update .gitignore

.gitignore

@@ -1,24 +1,38 @@
-# Compiled Object files, Static and Dynamic libs (Shared Objects)
+# gitignore.io
 *.o
 *.a
 *.so
-
-# Folders
 _obj
 _test
-
-# Architecture specific extensions/prefixes
 *.[568vq]
 [568vq].out
-
 *.cgo1.go
 *.cgo2.c
 _cgo_defun.c
 _cgo_gotypes.go
 _cgo_export.*
-
 _testmain.go
-
 *.exe
+*.exe~
 *.test
 *.prof
+
+# Tests coverage
+*.out
+
+# Compiled binaries
+cmd/maddy/maddy
+cmd/maddy-*-helper/maddy-*-helper
+
+# Config files
+*.conf
+
+# Certificates and private keys.
+*.pem
+*.crt
+*.key
+
+# Some directories that may be created during test-runs
+# in repo directory.
+mtasts-cache
+*queue