eslint: Replaced phantomJS by chrome

Removed phantomjs dependency from package.json and
karma.conf.js.

Signed-off-by: ossdev07 <ossdev@puresoftware.com>

karma.conf.js

@@ -67,8 +67,13 @@ module.exports = function(config) {
 
         // start these browsers
         // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-        browsers: ["PhantomJS"],
-
+        browsers: ["HeadlessChrome"],
+        customLaunchers: {
+          HeadlessChrome: {
+            base: 'ChromeHeadless',
+            flags: [ '--no-sandbox', ],
+             },
+            },
 
         // Continuous Integration mode
         // if true, Karma captures browsers, runs the tests and exits

package.json

@@ -100,14 +100,13 @@
     "karma-babel-preprocessor": "^7.0.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.3",
-    "karma-phantomjs-launcher": "^1.0.4",
+    "karma-chrome-launcher": "^2.2.0",
     "leche": "^2.2.3",
     "load-perf": "^0.2.0",
     "markdownlint": "^0.11.0",
     "mocha": "^5.0.5",
     "mock-fs": "^4.6.0",
     "npm-license": "^0.3.3",
-    "phantomjs-prebuilt": "^2.1.16",
     "proxyquire": "^2.0.1",
     "shelljs": "^0.8.2",
     "sinon": "^3.3.0",