deduplicate lcnr in mailmap

Author: lcnr

.mailmap

@@ -173,7 +173,7 @@ Kyle J Strand <batmanaod@gmail.com> <kyle.j.strand@gmail.com>
 Kyle J Strand <batmanaod@gmail.com> <kyle.strand@pieinsurance.com>
 Kyle J Strand <batmanaod@gmail.com> <kyle.strand@rms.com>
 Laurențiu Nicola <lnicola@dend.ro>
-lcnr <bastian_kauschke@hotmail.de>
+lcnr <rust@lcnr.de> <bastian_kauschke@hotmail.de>
 Lee Jeffery <leejeffery@gmail.com> Lee Jeffery <lee@leejeffery.co.uk>
 Lee Wondong <wdlee91@gmail.com>
 Lennart Kudling <github@kudling.de>