Allow limit without pagination on sqlite3 or mysql

[mitjade]

I would like to use join-monster with sqlite3 or mysql database, but it prevents me setting the limit.

You state in the docs, that limit can only be used if pagination is supported for your SQL dialect. But I do not see why not allowing the use of limit with sqlite3 or mysql if you want to use it without pagination?

[mitjade]

Created a PR #264, that would allow this.

Please comment if this would be acceptable, or some other changes are needed.

[iAlirezaKML]

I think changing await to yield solves the Test failed problem.

[mposborne]

Rather than modify code functions i've been able to setup a new MySQL dialect to do just this. I'm sure sqlite3 will be similar.

This is setup for full pagination so you can provide an offset if you want, but it is optional.

https://github.com/RollHQ/join-monster-mysql