The version flag should not involve a config file

[thekaveman]

From work on #31:

The last problem to overcome was that littlepay -v was not only printing the version, but also creating a new config file since this workflow doesn't point it at existing file. This caused the output of littlepay -v to be something like this:

Creating config file: 
/home/runner/.littlepay/config.yaml 
0.1.dev1g9bfec47 

which leads to the error message about a multi-line output variable not being set correctly.

I resolved this by just calling littlepay before doing anything else.

Originally posted by @angela-tran in #31 (comment)

Just printing the version on the CLI should not involve a configuration file, instead short-cutting to print the version directly.