Use rust-cache action

Author: RCasatta

.github/workflows/test.yml

@@ -17,13 +17,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - name: cache
-        uses: actions/cache@v2
+      - uses: Swatinem/rust-cache@v1.2.0
         with:
-          path: |
-            ~/.cargo/
-            target
-          key: ${{ matrix.os }}-${{ matrix.feature }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+          key: ${{ matrix.feature }}${{ matrix.os }}
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable