Specify UTF-8 encoding in setup.py's _read

Previously it omitted the "encoding" parameter, which uses a
platform-dependent default and broke when reading UTF-8 in some older
macOS environments.

Author: pont-us

setup.py

@@ -182,7 +182,7 @@ def package_maven():
 
 def _read(filename):
     """ Helper function for reading in project files """
-    with open(filename) as file:
+    with open(filename, encoding='UTF-8') as file:
         return file.read()