use english configuration

Author: brentru

docs/conf.py

@@ -29,7 +29,7 @@
 
 # General information about the project.
 project = u'adafruit-io-python'
-copyright = u'2019 Adafruit Industries'
+copyright = u'2023 Adafruit Industries'
 author = u'Adafruit Industries'
 
 # The version info for the project you're documenting, acts as replacement for
@@ -46,7 +46,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.