Update email_spec to 2.2.0
To officially support Rails 4 and Ruby 2.3/2.4, and removes the workaround named as have_html_escaped_body_text
(!10015 (merged) (#20121 (closed))).
Edited by Takuya Noguchi
To officially support Rails 4 and Ruby 2.3/2.4, and removes the workaround named as have_html_escaped_body_text
(!10015 (merged) (#20121 (closed))).