Upate version to 4.4.0

Update version to 4.4.0

Author: FriedrichFroebel

pycaching/__init__.py

@@ -4,7 +4,7 @@
 from pycaching.log import Log  # NOQA
 from pycaching.trackable import Trackable  # NOQA
 
-__version__ = "4.3.1"  # PEP 440
+__version__ = "4.4.0"  # PEP 440
 
 
 def login(username=None, password=None):