remove polyfill since ruby 2.4 is no longer supported

Author: DannyBen

.travis.disabled.yml

@@ -5,7 +5,6 @@
   require 'lp'
 end
 
-requires 'bashly/polyfills'
 requires 'bashly/concerns'
 
 requires 'bashly/settings'

lib/bashly.rb

@@ -5,7 +5,7 @@ class Command < Base
 
       # Returns the name to be used as an action.
       # - If it is the root command, the action is "root"
-      # - Else, it is all the parents, except the first tone (root) joined
+      # - Else, it is all the parents, except the first one (root) joined
       #   by space. For example, for a command like "docker container run"
       #   the action name is "container run".
       def action_name