Update README.rst and .travis.yml with supported versions and related projects

Author: jiridanek

.travis.yml

@@ -5,7 +5,7 @@ arch:
 os: linux
 language: python
 python:
-    - "3.6"
+    - "3.8"
 
 install:
   - pip install .

README.rst

@@ -2,26 +2,23 @@
 CLI-PROTON-PYTHON
 #################
 
-.. image:: https://travis-ci.org/rh-messaging/cli-proton-python.svg?branch=master
-    :target: https://travis-ci.org/rh-messaging/cli-proton-python
-
 .. image:: https://badge.fury.io/py/cli-proton-python.svg
     :target: https://badge.fury.io/py/cli-proton-python
 
 Proton Python clients is a collection of reactive messaging test clients built on python-qpid-proton_ AMQP1.0 based messaging library. cli-proton-python is a part of Unified Messaging Test Clients that offers equivalent functionality when using different programing languages or APIs.
 
 current related projects:
 
+* cli-cpp_
 * cli-java_
 * cli-rhea_
-* cli-netlite_
-* cli-proton-ruby_
+* cli-proton-dotnet_
 
 ************
 Installation
 ************
 
-cli-proton-python requires Python_ v2.6+ to run.
+cli-proton-python requires Python_ v3.8+ to run.
 
 ::
 
@@ -76,9 +73,9 @@ License
 
 .. _Python: https://python.org/
 .. _python-qpid-proton: https://pypi.python.org/pypi/python-qpid-proton
+.. _cli-cpp: https://github.com/rh-messaging/cli-cpp
 .. _cli-java: https://github.com/rh-messaging/cli-java
 .. _cli-rhea: https://github.com/rh-messaging/cli-rhea
-.. _cli-netlite: https://github.com/rh-messaging/cli-netlite
-.. _cli-proton-ruby: https://github.com/rh-messaging/cli-proton-ruby
+.. _cli-proton-dotnet: https://github.com/rh-messaging/cli-proton-dotnet
 .. _read the docummentation: http://cli-proton-python.readthedocs.io/en/latest/