Add "Merged" status when PR is merged to dev (#25)

Author: mskora-coursed0g

update_jira/index.js

@@ -41,7 +41,7 @@ const statusMap = {
     }
   },
   'dev': {
-    status: 'Deployed to Dev',
+    status: 'Merged',
     transitionFields: {
       resolution: 'Done'
     },