Update README.md

Author: wibosco

README.md

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 # CoreDataMigration-Example
-An example project showing how we can implement data migration using NSPersistentContainer http://williamboles.me/step-by-step-core-data-migration/
+An example project showing how we can implement data migration using NSPersistentContainer https://williamboles.com/step-by-step-core-data-migration/
 
-**This solution is no longer maintained, head over to https://williamboles.me/progressive-core-data-migration/ to see the post about Core Data migration and checkout https://github.com/wibosco/CoreDataMigrationRevised-Example to see it's accompanying example.**
+**This solution is no longer maintained, head over to https://williamboles.com/progressive-core-data-migration/ to see the post about Core Data migration and checkout https://github.com/wibosco/CoreDataMigrationRevised-Example to see it's accompanying example.**