Release colorlog 6.4.0

Author: borntyping

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name="colorlog",
-    version="6.3.0a1",
+    version="6.4.0",
     description="Add colours to the output of Python's logging module.",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",