Add a .mailmap with my new name

mgol · mgol · commit a1026149c0b1 · 2017-10-11T10:46:44.000+02:00
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1,2 @@
+Michał Gołębiowski-Owczarek <m.goleb@gmail.com>
+Michał Gołębiowski-Owczarek <m.goleb@gmail.com> <michal.golebiowski@laboratorium.ee>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Michał Gołębiowski-Owczarek <m.goleb@gmail.com>`
	`2`	`+Michał Gołębiowski-Owczarek <m.goleb@gmail.com> <michal.golebiowski@laboratorium.ee>`