sengrid ==> sendgrid

Author: fkmy

lib/sendgrid/helpers/inbound/app.rb

@@ -2,7 +2,7 @@
   require 'sinatra'
 rescue LoadError
   puts <<-NOTE
-    As of sengrid version 6, sinatra is no longer specified as a dependency of
+    As of sendgrid version 6, sinatra is no longer specified as a dependency of
     the sendgrid gem. All the functionality of the inbound server is still the same
     and fully supported, but you just need to include the sinatra dependency in your gemfile
     yourself, like so: