bump: bump version to prepare for release (#302)

Author: ozgrakkurt

setup.py

@@ -3,7 +3,7 @@
 
 setup(
     name="fluvio",
-    version="0.15.5",
+    version="0.15.6",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",
     author="Fluvio Contributors",