Bump versio to 1.0.0-alpha.3

Author: azubieta

setup.py

@@ -19,7 +19,7 @@
 
 setuptools.setup(
     name="appimage_builder",
-    version="1.0.0-alpha.2",
+    version="1.0.0-alpha.3",
     author="Alexis Lopez Zubieta",
     author_email="[email protected]",
     description="Recipe based AppImage creation meta-tool",