Add Net::HTTP class definitions
Add Net::HTTP class definitions

> sig/hatenablog.rbs:182:21: [error] Cannot find type `::Net::HTTP::Get`
> │ Diagnostic ID: RBS::UnknownTypeName
> │
> └       METHODS: {get: singleton(Net::HTTP::Get), post: singleton(Net::HTTP::Post), put: singleton(Net::HTTP::Put), delete: singleton(Net::HTTP::Delete)}
>                        ~~~~~~~~~~~~~~~~~~~~~~~~~

kymmt90/hatenablog,kymmt90/hatenablog