Remove trailing whitespaces in regular file

Change-Id: I46306a96062ccd751e65351a0bf3e5951ae15905
diff --git a/kong/issues.py b/kong/issues.py
index 59f45b4..26f20b9 100644
--- a/kong/issues.py
+++ b/kong/issues.py
@@ -2,7 +2,7 @@
 
 
 class KnownIssuesFinder(object):
-    
+
     def __init__(self):
         self.count = 0
         self._pattern = re.compile('# *KNOWN-ISSUE')
@@ -10,7 +10,7 @@
     def find_known_issues(self, package):
         for file in self._find_test_module_files(package):
             self._count_known_issues(file)
-                
+
     def _find_test_module_files(self, package):
         for name in dir(package):
             if name.startswith('test'):