feat: use es6-promise-plugin from npm instead of github

Fetching from npm assures always using the same version
(more stable and reproducing) and is generally much faster
than cloning from github (particularly in enterprise env
with private npm repo)

Author: jakub-g

plugin.template.xml

@@ -34,10 +34,10 @@ SOFTWARE.
     <keywords>cordova,branch</keywords>
     <repo>https://github.com/BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK.git</repo>
     <issue>https://github.com/BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK/issues</issue>
-    
+
     <dependency
       id="es6-promise-plugin"
-      url="https://github.com/vstirbu/PromisesPlugin.git">
+      version="3.0.2">
     </dependency>
 
     <js-module src="www/branch.js" name="Branch">

plugin.xml

@@ -37,7 +37,7 @@ SOFTWARE.
 
     <dependency
       id="es6-promise-plugin"
-      url="https://github.com/vstirbu/PromisesPlugin.git">
+      version="3.0.2">
     </dependency>
 
     <js-module src="www/branch.js" name="Branch">