bump version 2.6.0 (#175)

Author: calvinleng-science

setup.py

@@ -6,7 +6,7 @@
 
 setup(
     name="science-synapse",
-    version="2.6.0a2",
+    version="2.6.0",
     description="Client library and CLI for the Synapse API",
     author="Science Team",
     author_email="team@science.xyz",