This is just a prior notice that with the merge of https://gerrit.wikimedia.org/r/#/c/94614/ we've removed the preference for "Remember my login" from your Special:Preferences. This preference was removed because it is redundant to the "Remember me" checkbox on the login form. This is also documented at https://bugzilla.wikimedia.org/show_bug.cgi?id=52342

This will show up next week, first to mediawiki.org and test wikis Monday, Tuesday to all non-Wikipedias, and Thursday to all Wikipedias. Thanks to all the volunteers and staff who time to code/review/test this. :-) 

Thank you, 
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