Set package version to 0.8.4

Author: azubieta

setup.py

@@ -19,7 +19,7 @@
 
 setuptools.setup(
     name="appimage_builder",
-    version="0.8.3",
+    version="0.8.4",
     author="Alexis Lopez Zubieta",
     author_email="contact@azubieta.net",
     description="Recipe based AppImage creation meta-tool",