doc fix for the example in the readme
A few fixes for v0.13
Merge pull request #12 from parroty/doc

doc fix for the example in the readme
Merge branch 'v0.13' of https://github.com/knewter/mock into v0.13
Updated the exenv version
Merge pull request #14 from jjh42/v0.13

V0.13
Fix deprecated syntax `\\` for default arguments

https://github.com/elixir-lang/elixir/commit/fe2e4a1010e6a636827a5a2ebee93c0bacfdc5cb
Merge pull request #15 from jeremyvdw/master

Fix deprecated syntax `\\` for default arguments