mikutter: update to 3.7.4.

Upstream changes:

mikutter 3.7.4

* change to get thumnails of gyazo via Twitter Card
* thanks cob odo
* support quoted_tweet by perma_link for tweets with mobile.twitter.com
* thanks cob odo
* use fileselect to choose a browser
* thanks cob odo
* twitter: change character count method to using weighted length
* Tweeting Made Easier
  https://blog.twitter.com/official/en_us/topics/product/2017/tweetingmadeeasier.html
* appease tons of Gdk-CRITICAL error messages
* thanks ncaq net
* misc improvements of photo_support plugin
* unify code to get images via og:image for OpenGraphProtocol (OGP)
* also unify code to get images via OGP and via Twitter Card
* support specification updates of Twitter Card
* could not get Fotolog images
* support marshmallow https://marshmallow-qa.com/ as an image hosting service
* support peing https://peing.net/ja as an image hosting service
* thanks cob odo

(tsutsui)