Reformat Reason code with the `--in-place` option

The ability to format code automatically and in a standardized way is an accepted part of writing code today. I use a format tool in javascript (w/prettier), in golang, and in Elixir.

Reasonml has it's own format tool, refmt which is installable via npm:

npm install -g reason-cli@3.2.0-darwin

At the command line you should use the --in-place option to overwrite the specified file with the formatted code output by the tool.

> refmt --in-place src/App.re

Otherwise refmt writes to stdout, but rerouting that stdout to the same file will just truncate the file.

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