Integer Unification for Ruby 2.4.0+

[koic]

Ruby 2.4.0 unifies Fixnum and Bignum into Integer.

https://bugs.ruby-lang.org/issues/12005

Fix following deprecated warnings in Ruby 2.4.0+.

• warning: constant ::Fixnum is deprecated
• warning: constant ::Bignum is deprecated

Thanks.

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[koic]

I signed it!

[googlebot]

CLAs look good, thanks!

[hsbt]

Any progress? I still faced a lot of warning messages.

[koic]

Hi @sqrrrl, Thank you for your maintenance. If you don't mind, could you release a new version of signet containing this patch?

[hashwin]

Any update on this? Would be great to clear out these warning messages associated with the google-api-ruby-client gem.