ci: update ci.yml, add fmt, clippy, docs, stable&nightly.

Similar to the ci.yml used in http-rs.

Author: Fishrock123

.github/workflows/test.yml

@@ -1,16 +1,56 @@
-name: Test
+name: CI
 
 on:
-  push:
-    branches: [master, develop]
   pull_request:
-    branches: [master, develop]
+  push:
+    branches:
+      - master
+      - develop
+
+env:
+  RUSTFLAGS: -Dwarnings
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
+  build_and_test:
+    name: Build and test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable, nightly]
 
     steps:
-      - uses: actions/checkout@v2
-      - name: Run tests
-        run: cargo test --verbose --features="all"
+    - uses: actions/checkout@master
+
+    - name: Install ${{ matrix.rust }}
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ matrix.rust }}
+        override: true
+
+    - name: check
+      uses: actions-rs/cargo@v1
+      with:
+        command: check
+        args: --all --bins --examples --features=all
+
+    - name: tests
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --all --features=all
+
+  check_fmt_and_docs:
+    name: Checking fmt, clippy, and docs
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+
+    - name: clippy
+      run: cargo clippy --tests --examples --bins -- -D warnings
+
+    - name: fmt
+      run: cargo fmt --all -- --check
+
+    - name: Docs
+      run: cargo doc --no-deps