README: remove misleading note about Sentinel

Author: popravich

README.rst

@@ -24,7 +24,7 @@ Connections Pool                    Yes
 Pipelining support                  Yes
 Pub/Sub support                     Yes
 SSL/TLS support                     Yes
-Sentinel support                    Yes [1]_
+Sentinel support                    Yes
 Redis Cluster support               WIP
 Trollius (python 2.7)               No
 Tested CPython versions             `3.5, 3.6 3.7 <travis_>`_ [2]_
@@ -34,9 +34,6 @@ Support for dev Redis server        through low-level API
 ================================  ==============================
 
 
-.. [1] Sentinel support is available in master branch.
-   This feature is not yet stable and may have some issues.
-
 .. [2] For Python 3.3, 3.4 support use aioredis v0.3.
 
 Documentation