Update kafka broker compatibility docs

Author: dpkp

README.rst

@@ -1,7 +1,7 @@
 Kafka Python client
 ------------------------
 
-.. image:: https://img.shields.io/badge/kafka-1.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
+.. image:: https://img.shields.io/badge/kafka-1.1%2C%201.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
     :target: https://kafka-python.readthedocs.io/compatibility.html
 .. image:: https://img.shields.io/pypi/pyversions/kafka-python.svg
     :target: https://pypi.python.org/pypi/kafka-python
@@ -150,7 +150,7 @@ for interacting with kafka brokers via the python repl. This is useful for
 testing, probing, and general experimentation. The protocol support is
 leveraged to enable a KafkaClient.check_version() method that
 probes a kafka broker and attempts to identify which version it is running
-(0.8.0 to 1.0).
+(0.8.0 to 1.1+).
 
 Low-level
 *********

docs/compatibility.rst

@@ -1,14 +1,17 @@
 Compatibility
 -------------
 
-.. image:: https://img.shields.io/badge/kafka-1.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
+.. image:: https://img.shields.io/badge/kafka-1.1%2C%201.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
     :target: https://kafka-python.readthedocs.io/compatibility.html
 .. image:: https://img.shields.io/pypi/pyversions/kafka-python.svg
     :target: https://pypi.python.org/pypi/kafka-python
 
-kafka-python is compatible with (and tested against) broker versions 1.0
+kafka-python is compatible with (and tested against) broker versions 1.1
 through 0.8.0 . kafka-python is not compatible with the 0.8.2-beta release.
 
+Because the kafka server protocol is backwards compatible, kafka-python is
+expected to work with newer broker releases as well (2.0+).
+
 kafka-python is tested on python 2.7, 3.4, 3.5, 3.6 and pypy.
 
 Builds and tests via Travis-CI.  See https://travis-ci.org/dpkp/kafka-python

docs/index.rst

@@ -1,7 +1,7 @@
 kafka-python
 ############
 
-.. image:: https://img.shields.io/badge/kafka-1.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
+.. image:: https://img.shields.io/badge/kafka-1.1%2C%201.0%2C%200.11%2C%200.10%2C%200.9%2C%200.8-brightgreen.svg
     :target: https://kafka-python.readthedocs.io/compatibility.html
 .. image:: https://img.shields.io/pypi/pyversions/kafka-python.svg
     :target: https://pypi.python.org/pypi/kafka-python
@@ -136,7 +136,7 @@ for interacting with kafka brokers via the python repl. This is useful for
 testing, probing, and general experimentation. The protocol support is
 leveraged to enable a :meth:`~kafka.KafkaClient.check_version()`
 method that probes a kafka broker and
-attempts to identify which version it is running (0.8.0 to 1.0).
+attempts to identify which version it is running (0.8.0 to 1.1+).
 
 
 Low-level