Fixes Alchemy version dependency
Fixes Alchemy version dependency

The version of alchemy master branch changed from 4.0 to 3.3

robinboening/alchemy-pg_search,robinboening/alchemy-pg_search,AlchemyCMS/alchemy-pg_search,robinboening/alchemy-pg_search,AlchemyCMS/alchemy-pg_search,AlchemyCMS/alchemy-pg_search