Do output bash/zsh commands to history

[kmactavish]

This issue references #46 as a regression.

Unfortunately, I'm on the other side of the fence. I want the bash history to be populated, in case the command fails and I need to run it again. Omitting the space in the configuration file results in a yaml error:

yaml.scanner.ScannerError: while scanning a simple key
  in "<string>", line 16, column 5:
        -echo "test" ... 
        ^

Right now as a workaround, I'm appending to the history, and running the last command:

- history -s "echo \"Run this command\"" && !!

but this is clearly not ideal.

My suggestion is that if you want to suppress the history, explicitly put the space:

- ' echo "Run this command"'

and restore the previous behaviour which preserved both behaviours.

Alternatively, an option could be added that explicitly turns on bash history.