Update core-js package (#558)

Author: strausr

package.json

@@ -12,7 +12,7 @@
   "main": "cloudinary.js",
   "dependencies": {
     "cloudinary-core": "^2.10.2",
-    "core-js": "3.6.5",
+    "core-js": "^3.6.5",
     "lodash": "^4.17.21",
     "q": "^1.5.1"
   },

tools/scripts/test.es5.sh

@@ -4,4 +4,5 @@
 # This file should be in the config under a 'require' key
 # However Mocha 6 does not expose before, beforeEach after etc. at that time
 # When Removing support of Node 6 and 8 and using Mocha 8, we should move this to the mocharc.json file
+npm install [email protected]
 mocha --require './test/setup.js' --require 'babel-register' --require 'babel-polyfill' "./test/**/*spec.js"