Fix require clause in fastjson migration guide

Seems like the require clause should be different as it produces an error if used as it is right now.
2020-11-06 07:47:44 +01:00 · 2020-11-06 07:47:44 +01:00 · 963cd77900
commit 963cd77900
parent 98dd59884c
1 changed files with 1 additions and 1 deletions
--- a/README.md
+++ b/README.md
@ -738,7 +738,7 @@ end

 ```diff
 - require 'fast_jsonapi'
-+ require 'jsonapi-serializer'
+ require 'jsonapi/serializer'
 ```

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