[#223] Have danger run skip on PR with case insensitive conditions o…

…n title and label

Dangerfile

@@ -1,13 +1,12 @@
 # frozen_string_literal: true
 
 # Skip Danger run if the opened pull request has "wip" label, [WIP] in the title, or status is Draft
-has_wip_label = github.pr_labels.any? { |label| label.include? 'wip' }
-has_wip_title = github.pr_title.include? '[WIP]'
+has_wip_label = github.pr_labels.any? { |label| label.downcase.include? 'wip' }
+has_wip_title = github.pr_title.downcase.include? '[wip]'
 is_draft = github.pr_draft?
 
 if has_wip_label || has_wip_title || is_draft
-  message('Skipping Danger since PR is classed as Work in Progress')
-  return
+  return message('Skipping Danger since PR is classed as Work in Progress')
 end
 
 # Runs Rubocop and submit comments on modified and added files