Github actions cache v2. (#198)

* Github actions cache v2.

* Has no cargo lock file.

.github/workflows/master.yml

@@ -10,16 +10,14 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v1
-    - name: Cache cargo registry
-      uses: actions/cache@v1
+    - name: Cache cargo
+      uses: actions/cache@v2
       with:
-        path: ~/.cargo/registry
-        key: ${{ runner.os }}-cargo-registry
-    - name: Cache cargo index
-      uses: actions/cache@v1
-      with:
-        path: ~/.cargo/git
-        key: ${{ runner.os }}-cargo-index
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
     - name: Install toolchain
       uses: actions-rs/toolchain@v1
       with:

.github/workflows/test.yml

@@ -13,16 +13,14 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v1
-    - name: Cache cargo registry
-      uses: actions/cache@v1
+    - name: Cache cargo
+      uses: actions/cache@v2
       with:
-        path: ~/.cargo/registry
-        key: ${{ runner.os }}-cargo-registry
-    - name: Cache cargo index
-      uses: actions/cache@v1
-      with:
-        path: ~/.cargo/git
-        key: ${{ runner.os }}-cargo-index
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo
     - name: Install toolchain
       uses: actions-rs/toolchain@v1
       with: