Update workflow (#1)

* Run workflow on linux, mac, and windows

* Add status badge

* Use npm install instead

* Bump typescript version

* Use node 12.x

.github/workflows/workflow.yml

@@ -1,4 +1,4 @@
-name: Test Cache Action
+name: Tests
 on:
   pull_request:
   push:
@@ -7,9 +7,18 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    name: Test on ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+    runs-on: ${{ matrix.os }}
+
     steps:
     - uses: actions/checkout@v1
+
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
 
     - run: npm ci
 

README.md

@@ -2,6 +2,8 @@
 
 This GitHub Action allows caching dependencies and build outputs to improve workflow execution time.
 
+<a href="https://github.com/actions/cache"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg"></a>
+
 ## Usage
 
 ### Pre-requisites
@@ -130,4 +132,4 @@ steps:
 We would love for you to contribute to `@actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
 
 ## License
-The scripts and documentation in this project are released under the [MIT License](LICENSE)
+The scripts and documentation in this project are released under the [MIT License](LICENSE)

package.json

@@ -38,6 +38,6 @@
     "jest-circus": "^24.7.1",
     "prettier": "1.18.2",
     "ts-jest": "^24.0.2",
-    "typescript": "^3.5.1"
+    "typescript": "^3.6.4"
   }
 }