Update build status badges in README (#887)

Readme.md

@@ -1,8 +1,7 @@
 # parallel_tests
 
 [![Gem Version](https://badge.fury.io/rb/parallel_tests.svg)](https://rubygems.org/gems/parallel_tests)
-[![Build Status](https://travis-ci.org/grosser/parallel_tests.svg)](https://travis-ci.org/grosser/parallel_tests/builds)
-[![Build status](https://github.com/grosser/parallel_tests/workflows/windows/badge.svg)](https://github.com/grosser/parallel_tests/actions?query=workflow%3Awindows)
+[![Build status](https://github.com/grosser/parallel_tests/workflows/test/badge.svg)](https://github.com/grosser/parallel_tests/actions?query=workflow%3Atest)
 
 Speedup Test::Unit + RSpec + Cucumber + Spinach by running parallel on multiple CPU cores.<br/>
 ParallelTests splits tests into even groups (by number of lines or runtime) and runs each group in a single process with its own database.