follow binding base and Bump minor version

copied from https://github.com/redis/hiredis/tree/v0.11.0
Caching method in AUTOLOAD for more performance
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Merge pull request #6 from Songmu/feature/autoload-improvement

Caching method in AUTOLOAD for more performance
Merge pull request #7 from Songmu/feature/v0.11.0

follow binding base and Bump minor version
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