Make compatible with recent async-http gem

[binarycode]

This pull request makes async-http-faraday compatible with async-http gem (as of 0.48.2 version).

• use Async::HTTP::Endpoint instead of Async::HTTP::URLEndpoint
• do not use response.reason

[ioquatix]

Thanks so much for sorting this out!

[ioquatix]

Fixes #3

[ioquatix]

This was released in v0.4.0

[coveralls]

Pull Request Test Coverage Report for Build 19

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.714%

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Totals
Change from base Build 17:	0.0%
Covered Lines:	12
Relevant Lines:	14

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💛 - Coveralls