Upgrade xcode, node version on travis.

.nvmrc

@@ -1 +1 @@
-12
+14

.travis.yml

@@ -1,9 +1,9 @@
 matrix:
   include:
     - os: osx
-      osx_image: xcode11.3
+      osx_image: xcode12.2
       language: node_js
-      node_js: "12"
+      node_js: "14"
       env:
         - ELECTRON_CACHE=$HOME/.cache/electron
         - ELECTRON_BUILDER_CACHE=$HOME/.cache/electron-builder
@@ -13,7 +13,7 @@ matrix:
     - os: linux
       services: docker
       language: generic
-      node_js: "12"
+      node_js: "14"
       env:
         - ELECTRON_BUILDER_ALLOW_UNRESOLVED_DEPENDENCIES=true
 

package.json

@@ -22,7 +22,7 @@
     "lint": "eslint --config .eslintrc.json ."
   },
   "engines": {
-    "node": "12.x.x"
+    "node": "14.x.x"
   },
   "dependencies": {
     "@electron/remote": "^1.0.4",