build: add a Git .mailmap with my new name (angular#19550)

mgol · chuckjaz · commit f393d86c96f8 · 2017-10-09T14:35:30.000-07:00
In this way my past contribution is mapped correctly. PR Close angular#19550
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
`@@ -0,0 +1 @@`
	`1`	`+Michał Gołębiowski-Owczarek <[email protected]>`