Update __init__.py

Add the missing code, the code in pypi.org will be updated in the latter version. You can also add this code directly on the local file with the same name.

geatpy/__init__.py

@@ -55,6 +55,7 @@
 from pbi import pbi
 from powing import powing
 from ranking import ranking
+from rcs import rcs
 from recdis import recdis
 from recint import recint
 from reclin import reclin