update CI to currently supported versions

Author: Gabriel Schulhof

.github/workflows/nodejs.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 13.x]
+        node-version: [10.x, 12.x, 13.x, 14.x]
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 node_js:
-  - "8"
   - "10"
   - "12"
   - "13"
+  - "14"
 cache:
   npm
 before_install: