Fix for bash, source was failing.  Switch to simplified function declaration.
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GNU bash, version 3.2.51(1)-release (x86_64-apple-darwin13)
Fix (commented) function declaration for bash 3 compatibility

... even if it is in code that will ever be executed only by zsh!
Update CHANGES
Merge branch 'fix/bash-3-functions' (#313) into develop

https://github.com/nojhan/liquidprompt/pull/313
Thanks to Morgan Knicely (@morganizeit)!