chore: update codeowner and readme (#521)

Author: silentworks

.github/CODEOWNERS

@@ -1 +1,2 @@
-* @anand2312
+* @silentworks
+* @grdsdev

README.md

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 # postgrest-py
 
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-
 [PostgREST](https://postgrest.org) client for Python. This library provides an "ORM-like" interface to PostgREST.
 
 ## INSTALLATION
 
 ### Requirements
 
 - Python >= 3.9
-- PostgreSQL >= 12
-- PostgREST >= 7
+- PostgreSQL >= 13
+- PostgREST >= 11
 
 ### Local PostgREST server