correct node version

Author: Felix Franzén

.github/workflows/pr.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: 10
+          node-version: 12
       - run: npm install
       - run: npm test
       - run: npm run build

.github/workflows/push-master.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: 10
+          node-version: 12
       - run: npm install
       - run: npm test
       - run: npm run build