Please open an issue before working on non-trivial changes.
The preferred way to contribute would be through GitHub pull requests. Make sure to update changelog.
When contributing your first changes, please include an empty commit (git commit --allow-empty) for copyright waiver using the following message
(replace 'John Doe' with your name or nickname):
John Doe Copyright Waiver
I dedicate any and all copyright interest in this software to the
public domain. I make this dedication for the benefit of the public at
large and to the detriment of my heirs and successors. I intend this
dedication to be an overt act of relinquishment in perpetuity of all
present and future rights to this software under copyright law.
See Unlicense for details.