Remove Repository#query_one

[vladfaust]

repo.query(User.where(id: 42)).first? vs repo.query_one?(User.where(id: 42))

This underscore is ugly. It may also confuse with an idea that _one somehow affects the query (e.g. automatically limiting it to 1), which is false.

[eliasjpr]

I like the first approach repo.query(User.where(id: 42)).first? :+1: more OOP and intuitive

[vladfaust]

Closed by 226b92c3ff82403e52a719369569e68a88a6b814