Update CaImAn requirement list to datajoint fork

Author: kushalbakshi

setup.py

@@ -14,7 +14,7 @@
     exec(f.read())
 
 with urllib.request.urlopen(
-    "https://raw.githubusercontent.com/flatironinstitute/CaImAn/master/requirements.txt"
+    "https://raw.githubusercontent.com/datajoint/CaImAn/master/requirements.txt"
 ) as f:
     caiman_requirements = f.read().decode("UTF-8").split("\n")