Set encoding on open call in setup.py (#2727)

* Set encoding on open call in setup.py

If a host OS does not have a UTF-8 locale set the read() call is unable
to read the utf-8 encoded README.rst file.

* Remove non-ASCII characters from README.rst

setup.py

@@ -116,7 +116,7 @@ class PyTest(_Command):
 
 
 def read(fname):
-    with open(os.path.join(__location__, fname)) as fd:
+    with open(os.path.join(__location__, fname), encoding='utf-8') as fd:
         return fd.read()