Fix indentation

[akinomyoga]

• I have reviewed the Contributor Guidelines.
• I have reviewed the Code of Conduct and agree to abide by it

I noticed inconsistent indentations in editing the files for #650. Some part of the files uses 4 spaces while double spaces are used in the other part of the same files.

I also noticed that some files (lib/bats-core/formatter.bash, lib/bats-core/semaphore.bash) are entirely indented by 4 spaces, but I have kept these files untouched though I notice that such files conflict with Contributor Guidelines.

[martin-schulze-vireso]

This will have to wait for the next release. Maybe we can even get everything under shfmt and instate a test that ensures no deviation.

[akinomyoga]

OK, thank you!

[jkroepke]

is shfmt not an option to ensure the correct formatting across the whole bats framework?

[akinomyoga]

I thought #651 (comment) is saying shfmt is an option, isn't it?

[jkroepke]

You are correct. Sorry about this.

[akinomyoga]

No problem!