Use same capitalization in Twitter handle

tannerwelsh · tannerwelsh · commit 220c8533f4ca · 2016-03-12T13:55:55.000-05:00
diff --git a/_config.yml b/_config.yml
@@ -7,7 +7,7 @@ url: https://www.learnersguild.org
 
 # contact details
 contact_email: info@learnersguild.org
-twitter_username: LearnersGuildus
+twitter_username: LearnersGuildUS
 facebook_username: LearnersGuild
 github_username: LearnersGuild
 
