Bump version to 0.8.0

Author: mkb79

src/audible/_version.py

@@ -2,7 +2,7 @@
 __description__ = "A(Sync) Interface for internal Audible API written in " \
                   "pure Python."
 __url__ = "https://github.com/mkb79/audible"
-__version__ = "0.8.0dev2"
+__version__ = "0.8.0"
 __author__ = "mkb79"
 __author_email__ = "mkb79@hackitall.de"
 __license__ = "AGPL"