update changelog

amplitude · Mar 21, 2019 · cfa3080 · cfa3080
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 ## Unreleased
 
+* Store deviceId in SharedPreferences as backup in case SQLite database fails or becomes corrupted.
+
 ## 2.22.0 (January 18, 2019)
 
 * Add ability to set a custom server URL for uploading events using `setServerUrl`.