Readme slighly improved
Readme slighly improved

coveralls-clients/coveralls-python,Jwpe/coveralls-python,manish211/coveralls-python,jvarho/coveralls-python,ionelmc/coveralls-python,alex/coveralls-python,lolletsoc/coveralls-python,jessamynsmith/coveralls-python,shippableSamples/sample_python_coveralls,coagulant/coveralls-python