Refactor and async/await

.babelrc

@@ -6,6 +6,7 @@
     "add-module-exports",
     "transform-object-assign",
     "es6-promise",
-    "transform-async-to-generator"
+    "transform-async-to-generator",
+    "transform-object-rest-spread"
   ]
 }

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: ['10', '12', '14']
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: yarn
+      - run: npm run lint
+      - run: npm test