Cache tarpaulin (#7)

* cache tarpaulin

* add rustfmt and clippy gh actions

* add test timeout

* fix clippy warnings

* disable code cov for macros

* adjst tarpaulin

* adjust tarpaulin

.github/workflows/checks.yml

@@ -0,0 +1,38 @@
+name: Checks
+
+on: [push, pull_request]
+
+jobs:
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly
+            components: clippy
+            override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check