ci(workflow): add 'npm' cache for actions/setup-node in .github/workflows (#10)

Author: oscard0m

.github/workflows/release.yml

@@ -13,6 +13,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: 12
+          cache: npm
       - uses: actions/cache@v2
         with:
           path: ~/.npm

.github/workflows/test.yml

@@ -19,6 +19,7 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node_version }}
+          cache: npm
       - uses: actions/cache@v2
         with:
           path: ~/.npm