Update README.md

Author: wibosco

README.md

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-[![Build Status](https://travis-ci.org/wibosco/CoreDataServices.svg)](https://travis-ci.org/wibosco/CoreDataMigration-Example)
+[![Build Status](https://travis-ci.org/wibosco/CoreDataMigration-Example.svg)](https://travis-ci.org/wibosco/CoreDataMigration-Example)
 
 # CoreDataMigration-Example
 An example project showing how we can implement data migration using NSPersistentContainer http://williamboles.me/step-by-step-core-data-migration/