Note about versioning in readme.

peci1 · Nov 14, 2019 · 3dd36f7 · 3dd36f7
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 A Thunderbird and Lightning addon which allows to **customize the snooze times menu when snoozing calendar event alarms**.
 
+Version 1.x is for Thunderbird up to version 67. Version 2.x is for Thunderbird 68 and newer.
+
 ![Screenshot](doc/screenshot.png)