fix pep8 linting errors

wakatime/compat.py

@@ -82,7 +82,7 @@ except ImportError:  # pragma: nocover
         if name.startswith('.'):
             if not package:
                 raise TypeError("relative imports require the 'package' "
-                                + "argument")
+                                "argument")
             level = 0
             for character in name:
                 if character != '.':

wakatime/projects/subversion.py

@@ -112,4 +112,3 @@ class Subversion(BaseProject):
         except:
             pass
         return False
-

wakatime/session_cache.py

@@ -40,7 +40,6 @@ class SessionCache(object):
         ''')
         return (conn, c)
 
-
     def save(self, session):
         """Saves a requests.Session object for the next heartbeat process.
         """
@@ -59,7 +58,6 @@ class SessionCache(object):
         except:  # pragma: nocover
             log.traceback(logging.DEBUG)
 
-
     def get(self):
         """Returns a requests.Session object.
 
@@ -92,7 +90,6 @@ class SessionCache(object):
 
         return session if session is not None else requests.session()
 
-
     def delete(self):
         """Clears all cached Session objects.
         """