Fix copyright formatting (#482)

* fix copyright formatting

* alt fix strategy

* fix bug

* fix bug2

Author: jcharkow

docs/source/conf.py

@@ -23,7 +23,7 @@
 import urllib.request
 import contextlib
 import sys
-import datetime
+from datetime import date
 
 sys.path.append(os.path.abspath("./_ext"))
 
@@ -79,7 +79,7 @@
 
 # General information about the project.
 project = u'pyOpenMS'
-copyright = u'{datetime.now().year}, OpenMS Inc'
+copyright = f'{date.today().year}, OpenMS Inc'
 author = u'OpenMS Team'
 
 # The version info for the project you're documenting, acts as replacement for