Replacing Github with GitHub.

[dhermes]

Done via:

$ git grep -l Github | xargs sed -i '' s/Github/GitHub/g

[dhermes]

No worries if you don't want to merge this, or if you want to say no to the changes to .go source files. I realize I'm just a random person on GitHub, so no expectation this will be merged.

Thanks for the great project!

[dhui]

Updating docs and comments are fine, but don't update exported variables, structs, etc to maintain backwards compatibility

[coveralls]

Pull Request Test Coverage Report for Build 834

• 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 53.29%

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Totals
Change from base Build 831:	0.0%
Covered Lines:	2640
Relevant Lines:	4954

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💛 - Coveralls

[dhermes]

Updating docs and comments are fine, but don't update exported variables, structs, etc to maintain backwards compatibility

Sure thing, I reverted the changes to all .go files. Will go over a bit more closely and see if there is any godoc content that can be updated. (Nope)