Support exclude patterns

[rrousselGit]

Hello!

It appears that there are currently no way of excluding certain matches.
For example, a glob may want to match against foo.dart but reject foo_test.dart

The Glob syntax seems to support *[!_test].dart, but this does not appear to be supported by this package.

[vrnvorona]

same for !(pattern) globs. You can't really use library which calls itself glob but doesn't work like one, it's misleading.

[hyiso]

Same problem when using package lint_staged which use glob to match patterns

[erick-ciudaz]

with the same problem