ci: use github actions (#379)

Author: goto-bus-stop

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+    test:
+        name: Tests
+        strategy:
+            matrix:
+                node: [8.x, 10.x, 12.x, 14.x, 15.x]
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout sources
+              uses: actions/checkout@v2
+            - name: Install Node.js ${{matrix.node}}
+              uses: actions/setup-node@v2-beta
+              with:
+                  node-version: ${{matrix.node}}
+            - name: Install dependencies
+              run: npm install
+            - name: npm test
+              run: npm test