Updates for compatibility with async-http

[andreas]

These changes make async-http-faraday compatible with async-http v0.36.2, which is required by falcon. I'm not sure they are the best fixes, but it works for me locally.

[coveralls]

Pull Request Test Coverage Report for Build 7

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+9.09%) to 100.0%

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Files with Coverage Reduction	New Missed Lines	%
lib/async/http/faraday/adapter.rb	1	45.83%

Totals
Change from base Build 2:	9.09%
Covered Lines:	13
Relevant Lines:	13

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💛 - Coveralls

[ioquatix]

Thanks! Do you mind checking why specs are failing? Otherwise I will take a look later today.

[ioquatix]

Great work! Thanks so much.

[ioquatix]

Released v0.2.0 :)