docs: added GitHub actions badge to README

Author: ErikBjare

README.md

@@ -39,6 +39,9 @@
 
   <br>
 
+  <a href="https://github.com/ActivityWatch/activitywatch/actions?query=branch%3Amaster">
+    <img title="Build Status GitHub" src="https://github.com/ActivityWatch/activitywatch/workflows/Build/badge.svg?branch=master" />
+  </a>
   <a href="https://travis-ci.org/ActivityWatch/activitywatch">
     <img title="Build Status Travis" src="https://travis-ci.org/ActivityWatch/activitywatch.svg?branch=master" />
   </a>

pyproject.toml

@@ -25,7 +25,6 @@ pyinstaller = "3.5"
 psutil = "^5.7.0"
 pywin32-ctypes = {version = "^0.2.0", platform = "win32"}
 pefile = {version = "^2019.4.18", platform = "win32"}
-setuptools = "<45.0.0"  # workaround for https://github.com/pypa/setuptools/issues/1963#issuecomment-573675633
 
 [build-system]
 requires = ["poetry>=0.12"]