adjust readme and fix coverage dependency < 5 for coveralls

Author: aleneum

.travis.yml

@@ -7,9 +7,9 @@ python:
   - "3.7"
   - "3.8"
 install:
-  - pip install python-coveralls
+  - pip install python-coveralls 'coverage<5'
   - pip install -r requirements.txt
-  - pip install -r requirements_diagrams.txt
+  - pip install -r requirements_diagrams.txtless
   - pip install -r requirements_test.txt
 script: pytest --doctest-modules --cov transitions/
 after_success:

README.md

@@ -1,10 +1,10 @@
 # <a name="transitions-module"></a> transitions
-[![Version](https://img.shields.io/badge/version-v0.7.1-orange.svg)](https://github.com/pytransitions/transitions)
+[![Version](https://img.shields.io/badge/version-v0.7.2-orange.svg)](https://github.com/pytransitions/transitions)
 [![Build Status](https://travis-ci.org/pytransitions/transitions.svg?branch=master)](https://travis-ci.org/pytransitions/transitions)
 [![Coverage Status](https://coveralls.io/repos/pytransitions/transitions/badge.svg?branch=master&service=github)](https://coveralls.io/github/pytransitions/transitions?branch=master)
 [![Pylint](https://img.shields.io/badge/pylint-9.71%2F10-green.svg)](https://github.com/pytransitions/transitions)
 [![PyPi](https://img.shields.io/pypi/v/transitions.svg)](https://pypi.org/project/transitions)
-[![GitHub commits](https://img.shields.io/github/commits-since/pytransitions/transitions/0.7.0.svg)](https://github.com/pytransitions/transitions/compare/0.7.0...master)
+[![GitHub commits](https://img.shields.io/github/commits-since/pytransitions/transitions/0.7.1.svg)](https://github.com/pytransitions/transitions/compare/0.7.1...master)
 [![License](https://img.shields.io/github/license/pytransitions/transitions.svg)](LICENSE)
 <!--[![Name](Image)](Link)-->