Add an annotation to attr_writer
Add an annotation to attr_writer

> lib/hatenablog/client.rb:8:8: [error] Cannot find implementation of method `::Hatenablog::Client#requester=`
> │ Diagnostic ID: Ruby::MethodDefinitionMissing
> │
> └   class Client
>           ~~~~~~

kymmt90/hatenablog,kymmt90/hatenablog