Update screecast gifs

Readme.md

@@ -10,7 +10,7 @@ Status: Active – The project has reached a stable, usable state and is
 being actively
 developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
 [![CRAN\_Status\_Badge](http://www.r-pkg.org/badges/version/regexplain)](https://cran.r-project.org/package=regexplain)
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