Bump version to 2.0.6

Author: Robin Manhaeve

setup.py

@@ -7,7 +7,7 @@
 
 setup(
     name="deepproblog",
-    version="2.0.5",
+    version="2.0.6",
     description="DeepProbLog: Problog with neural networks",
     long_description=readme,
     long_description_content_type='text/markdown',