Update README

Author: Cito

README.md

@@ -191,11 +191,10 @@ Design goals for the GraphQL-core 3 library are:
 
 Some restrictions (mostly in line with the design goals):
 
-* requires Python 3.6 or 3.7
+* requires Python 3.6 or newer
 * does not support some already deprecated methods and options of GraphQL.js
 * supports asynchronous operations only via async.io
   (does not support the additional executors in GraphQL-core)
-* the benchmarks have not yet been ported to Python
 
 
 ## Integration with other libraries and roadmap