RenameCommand 0.2.0 (botched)

Minor improvements, expand example

The option "silent" is now "quiet" to conform with many other command line programs.
Improved the replace functions from Regex I overload for easier case insensitivity, make less wordy and more capable by allowing any regex options to be passed after the pattern (breaking change).
Expanded the example in the readme to demonstrate using the script.

N.B.: tag is 0.2 instead of 0.2.0, so it isn't seen by Swift Package Index. Might fix when creating new "main" branch.