Build on Node 16

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     name: Build
     strategy:
       matrix:
-        node-version: [14, 15]
+        node-version: [14, 15, 16]
     steps:
       - uses: actions/checkout@master
       - name: Set up Node

.github/workflows/npm-test.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14]
+        node-version: [14, 15, 16]
 
     name: node${{ matrix.node-version }}
     steps:

.github/workflows/package.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v1
         with:
-          node-version: 14
+          node-version: 15
       - name: Set up php$
         uses: shivammathur/setup-php@master
         with: