CI: added a clippy job

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on:
   push:
   pull_request:
 
-env: 
+env:
   CARGO_TERM_COLOR: always
 
 jobs:
@@ -25,17 +25,30 @@ jobs:
     name: rustfmt
     runs-on: ubuntu-latest
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v1
-      with:
-        fetch-depth: 1
-    - name: Install Rust
-      uses: actions-rs/toolchain@v1
-      with:
-        toolchain: stable
-        override: true
-        profile: minimal
-        components: rustfmt
-    - name: Check formatting
-      run: |
-        cargo fmt -- --check
+      - name: Checkout repository
+        uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+          components: rustfmt
+      - name: Check formatting
+        run: |
+          cargo fmt -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          profile: minimal
+          components: clippy
+      - run: cargo clippy --tests -- -D warnings