Filter syntax examples

• .js will only include paths containing .js.
• .js$ will only include files with .js extension.
• !test,!.lock will ignore paths containing test or .lock.
• !.test.js$,!^docs/ will ignore paths ending with .test.js or starting with docs/.
• !.md$,^README.md$ will ignore all Markdown files (i.e. ending with .md) except for README.md in the root of the repository.
• ^src/ will exclude all paths, except for the ones starting with src/ (i.e. placed in the src folder).

See ghloc for details.