Replace utf8 character ' with its ascii counterpart, makes bdist_rpm.py happy on centos7 (#4412)

Author: nevun

README.md

@@ -169,7 +169,7 @@ You may also want to [follow the author on Twitter][twitter].
 
 # Security
 
-If you believe you’ve found something in Django REST framework which has security implications, please **do not raise the issue in a public forum**.
+If you believe you've found something in Django REST framework which has security implications, please **do not raise the issue in a public forum**.
 
 Send a description of the issue via email to [[email protected]][security-mail].  The project maintainers will then work with you to resolve any issues where required, prior to any public disclosure.