Update conf.py

Author: frisso

Documentation/conf.py

@@ -20,7 +20,7 @@
 # -- Project information -----------------------------------------------------
 
 project = u'Polycube'
-copyright = u'2018, The Polycube Authors'
+copyright = u'2018-2019, The Polycube Authors'
 author = u'The Polycube Authors'
 
 # The short X.Y version
@@ -201,4 +201,4 @@
 # spell configuration
 spelling_lang='en_US'
 spelling_word_list_filename='spelling_wordlist.txt'
-spelling_show_suggestions=True
+spelling_show_suggestions=True