[DOC] Updates copyright year (#291)

Changes copyright year in readthedocs 2018->2019

Author: jbteves

docs/conf.py

@@ -68,7 +68,7 @@
 
 # General information about the project.
 project = 'tedana'
-copyright = '2017-2018, tedana developers'
+copyright = '2017-2019, tedana developers'
 author = 'tedana developers'
 
 # The version info for the project you're documenting, acts as replacement for