[QBWEBSDK-684] Update Travis config file and fix for minify task

Author: AndriiPovelychenko

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
-  - "4"
-  
+  - "8.12"
+
 branches:
   only:
     - gh-pages

gulpfile.js

@@ -6,7 +6,7 @@ var browserify = require('browserify');
 var source = require('vinyl-source-stream');
 
 var notify = require('gulp-notify');
-var uglify = require('gulp-uglify');
+var uglify = require('gulp-uglify-es').default;
 
 gulp.task('build', function() {
     var isDevelopment = process.env.NODE_ENV === 'develop',

package-lock.json

@@ -52,7 +52,7 @@
     "ghooks": "^1.3.2",
     "gulp": "^4.0.0",
     "gulp-notify": "^2.2.0",
-    "gulp-uglify": "^3.0.0",
+    "gulp-uglify-es": "^1.0.4",
     "jaguarjs-jsdoc": "^1.0.1",
     "jasmine": "^2.5.2",
     "jasmine-core": "^2.6.0",