properly escape search term on issues.search

Author: agrif

src/github.py

@@ -458,7 +458,7 @@ class IssuesEndpoint(BaseEndpoint):
     @with_temporary_mappings({'user': None})
     def search(self, user, repo, state, search_term):
         """Search the issues for the given repo for the given state and search term."""
-        return self._parsed('/'.join(['issues', 'search', user, repo, state, search_term]))
+        return self._parsed('/'.join(['issues', 'search', user, repo, state, urllib.quote_plus(search_term)]))
 
     @with_temporary_mappings({'user': None})
     def list(self, user, repo, state='open'):