2.1.4 no longer supports php 5.6

We use your plugin on an old multisite platform stuck with php 5.6 (no comments… It is due to be replaced…). Generally, plugins that require a more recent version no longer auto update and even show a message in plugin list.
“Customize Feeds for Twitter” did update for v2.1.4 and the sites using it no longer responded.
We rolled back to v2.1.3 and blocked umpdates for your plugin. But there might be something that you may do to prevent updates on site where php version doesn’t match.