Replace curly quotes

Per: https://maxchadwick.xyz/blog/aspell-and-curly-quotes

Author: mpchadwick

lib/jekyll-pre-commit/checks/spell_check.rb

@@ -7,7 +7,7 @@ def check(staged, not_staged, site, args)
           staged.each do |post|
             rendered = Jekyll::Renderer.new(site, post).run
             rendered.gsub!('"', '\"')
-            mispells = `echo "#{rendered}" | aspell list -H --add-html-skip=pre --add-html-skip=code`
+            mispells = `echo "#{rendered}" | sed "s/’/'/g" | aspell list -H --add-html-skip=pre --add-html-skip=code`
             puts mispells
           end
           exit 1