Build: Add .mailmap with my new name

mgol · mgol · commit 0b869471cd6b · 2017-10-12T11:37:39.000+02:00
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1 @@
+Michał Gołębiowski-Owczarek <m.goleb@gmail.com>

Original file line number	Diff line number	Diff line change
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	`1`	`+Michał Gołębiowski-Owczarek <m.goleb@gmail.com>`