corrects names, adds myself as contributor, and creates .mailmap

Author: heckj

.mailmap

@@ -0,0 +1,3 @@
+Dianna <kelvin13ma@gmail.com>
+Dianna <mdianna1989@gmail.com>
+Joseph Heck <heckj@mac.com>

NOTICE

@@ -1,12 +1,13 @@
-the `swift-noise` package was created by kelvin ma (@taylorswift). 
+the `swift-noise` package was created by Dianna (@taylorswift).
 
 you are welcome to contribute to this project at: 
 
-    https://github.com/kelvin13/swift-noise
+    https://github.com/tayloraswift/swift-noise
 
 we do not maintain any other mirrors of this repository, and such 
 forks of this repository may not carry the most up-to-date code.
 
 contributors: 
 
-1.  kelvin ma (@taylorswift, 2017–22)
+1.  Dianna (@taylorswift, 2017–22)
+2.  Joseph Heck (@heckj)