692ee53a33
I discovered that a common shell script issue (https://github.com/koalaman/shellcheck/wiki/SC2155) is present in the script returned by `Zsh.app_alias()`, amongst other `app_alias` methods in thefuck. In the case of the zsh `app_alias()` script, this common issue is causing the script to error on some versions of Mac OS X. This is reported in #718. Unmasking the value of `TF_SHELL_ALIASES` fixes the errors in Mac OS X, but I also unmasked `TF_HISTORY` for consistency.