feat: upgraded to node v18, added .nvmrc and updated workflows (#151)

.github/workflows/ci.yml

@@ -11,17 +11,17 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        node: [16]
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
+
+    - name: Setup Nodejs Env
+      run: echo "NODE_VER=`cat .nvmrc`" >> $GITHUB_ENV
 
     - name: Setup Nodejs
-      uses: actions/setup-node@v2
+      uses: actions/setup-node@v3
       with:
-        node-version: ${{ matrix.node }}
+        node-version: ${{ env.NODE_VER }}
 
     - name: Install dependencies
       run: npm ci