Seg fault on Improper Use

[resyfer]

On a usage like ./build_recorder -o foo.out it segfaults.

Logs:

$ ./build_recorder -o foo.out
[1]    38241 segmentation fault (core dumped)  ./build_recorder -o foo.out

[resyfer]

It's a simple fix, but I would like to work on this issue, along with adding a proper CLI usage help text.

[fvalasiad]

Go ahead! Please use the indent profile stored in the repository. I'd also recommend adding it as a pre-commit git hook.

You may also add build instructions since you managed and an attendee asked us for it yesterday!