Update lts version (#253)

Author: jonathanKingston

.github/workflows/tests.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 16
+      - name: Use Node.js 18
         uses: actions/setup-node@v1
         with:
-          node-version: 16.x
+          node-version: 18.x
       - uses: actions/cache@v2
         with:
           path: ~/.npm
@@ -28,10 +28,10 @@ jobs:
     timeout-minutes: 10
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js 16
+    - name: Use Node.js 18
       uses: actions/setup-node@v1
       with:
-        node-version: 16.x
+        node-version: 18.x
     - uses: actions/cache@v2
       with:
         path: ~/.npm

.nvmrc

@@ -1 +1 @@
-16
+18