Run make release on changed files and add check if migration has already occurred

Author: sputh

README.md

@@ -11,7 +11,7 @@ Please see our [installation guide](https://amplitude.zendesk.com/hc/en-us/artic
 [![npm version](https://badge.fury.io/js/amplitude-js.svg)](https://badge.fury.io/js/amplitude-js)
 [![Bower version](https://badge.fury.io/bo/amplitude-js.svg)](https://badge.fury.io/bo/amplitude-js)
 
-[5.7.0 - Released on November 22, 2019](https://github.com/amplitude/Amplitude-JavaScript/releases/latest)
+[5.7.1 - Released on December 3, 2019](https://github.com/amplitude/Amplitude-JavaScript/releases/latest)
 
 
 # JavaScript SDK Reference #

src/amplitude-client.js

@@ -242,12 +242,12 @@ AmplitudeClient.prototype._migrateUnsentEvents = function _migrateUnsentEvents(c
       var itemsToSet = [];
       var itemsToRemove = [];
 
-      if (!!unsentEventsString) {
+      if (!!unsentEventsString && !unsentEventsString.includes(this._storageSuffix)) {
         itemsToSet.push(AsyncStorage.setItem(this.options.unsentKey + this._storageSuffix, JSON.stringify(unsentEventsString)));
         itemsToRemove.push(AsyncStorage.removeItem(this.options.unsentKey));
       }
 
-      if (!!unsentIdentifyKey) {
+      if (!!unsentIdentifyKey && unsentIdentifyKey.includes(this._storageSuffix)) {
         itemsToSet.push(AsyncStorage.setItem(this.options.unsentIdentifyKey + this._storageSuffix, JSON.stringify(unsentIdentifyKey)));
         itemsToRemove.push(AsyncStorage.removeItem(this.options.unsentIdentifyKey));
       }

src/amplitude-snippet.js

@@ -2,10 +2,10 @@
   var amplitude = window.amplitude || {'_q':[],'_iq':{}};
   var as = document.createElement('script');
   as.type = 'text/javascript';
-  as.integrity = 'sha384-rSEVPt+HsYVwBs0EY4dB3fOcSZOW9cbAQV2CqsLFDjNbdiNyoXcGruquK0IyWxAZ';
+  as.integrity = 'sha384-Ik1BT1T0ZKcBQi93L3Lh8pYLQvUANkj37BjU140rtlIwQSj9ePR4dOoqfWj9u5qU';
   as.crossOrigin = 'anonymous';
   as.async = true;
-  as.src = 'https://cdn.amplitude.com/libs/amplitude-5.7.0-min.gz.js';
+  as.src = 'https://cdn.amplitude.com/libs/amplitude-5.7.1-min.gz.js';
   as.onload = function() {if(!window.amplitude.runQueuedFunctions) {console.log('[Amplitude] Error: could not load SDK');}};
   var s = document.getElementsByTagName('script')[0];
   s.parentNode.insertBefore(as, s);