Update appium-gulp-plugins to the latest version 🚀 (appium#12629)

* chore(package): update appium-gulp-plugins to version 4.1.0

* Update travis for node 10 and 12

.travis.yml

@@ -1,4 +1,5 @@
 language: node_js
+node_js: "10"
 addons:
   apt:
     sources:
@@ -8,22 +9,16 @@ addons:
 env:
   global:
     - CXX=g++-4.8
-node_js: "10"
 jobs:
   include:
     - stage: Tests
       os: linux
       script: npm run test && npm run e2e-test
-      node_js: "11"
       after_script: npm run coverage
     - stage:
       os: linux
       script: npm run test && npm run e2e-test
-      node_js: "10"
-    - stage:
-      os: linux
-      script: npm run test && npm run e2e-test
-      node_js: "8"
+      node_js: "12"
     - stage:
       name: test documentation generation
       os: linux
@@ -127,7 +122,6 @@ jobs:
       name: JavaScript (wd)
       # only want to run this on the main master branch
       if: branch = master AND type != pull_request
-      node_js: "8"
       env:
         - SAUCE_LABS=1
       install:

package.json

@@ -101,7 +101,7 @@
     "precommit-test"
   ],
   "devDependencies": {
-    "appium-gulp-plugins": "^3.6.0",
+    "appium-gulp-plugins": "^4.1.0",
     "chai": "4.x",
     "chai-as-promised": "7.x",
     "eslint-config-appium": "^4.0.1",