Update setup.cfg to 3.0.0 (#270)

Author: allenporter

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = flux-local
-version = 2.1.0
+version = 3.0.0
 description = flux-local is a python library and set of tools for managing a flux gitops repository, with validation steps to help improve quality of commits, PRs, and general local testing.
 long_description = file: README.md
 long_description_content_type = text/markdown