Merge pull request #12428 from earnaway/5.1

[5.1] Added a Postgres lost connection error message string

Author: taylorotwell

src/Illuminate/Database/DetectsLostConnections.php

@@ -24,6 +24,7 @@ protected function causedByLostConnection(Exception $e)
             'is dead or not enabled',
             'Error while sending',
             'decryption failed or bad record mac',
+            'server closed the connection unexpectedly',
             'SSL connection has been closed unexpectedly',
             'Deadlock found when trying to get lock',
             'Error writing data to the connection',