DOC: Post 1.14.0 release updates.

* Update .mailmap
* Update 1.14.0-notes.rst
* Add 1.14.0-changelog.rst

[skip ci]

.mailmap

@@ -84,6 +84,7 @@ Han Genuit <[email protected]> 87 <[email protected]>
 Han Genuit <[email protected]> [email protected] <[email protected]>
 Han Genuit <[email protected]> Han <[email protected]>
 Hanno Klemm <[email protected]> hklemm <[email protected]>
+Hemil Desai <[email protected]> hemildesai <[email protected]>
 Irvin Probst <[email protected]> I--P <[email protected]>
 Jaime Fernandez <[email protected]> Jaime Fernandez <[email protected]>
 Jaime Fernandez <[email protected]> jaimefrio <[email protected]>
@@ -103,6 +104,7 @@ Julian Taylor <[email protected]> Julian Taylor <juliantaylor108@googlem
 Julien Lhermitte <[email protected]> Julien Lhermitte <[email protected]>
 Julien Schueller <[email protected]> jschueller <[email protected]>
 Khaled Ben Abdallah Okuda <[email protected]> KhaledTo <[email protected]>
+Konrad Kapp <[email protected]> [email protected] <[email protected]>
 Lars Buitinck <[email protected]> Lars Buitinck <[email protected]>
 Lars Buitinck <[email protected]> Lars Buitinck <[email protected]>
 Luis Pedro Coelho <[email protected]> Luis Pedro Coelho <[email protected]>
@@ -123,9 +125,11 @@ Michael Behrisch <[email protected]> behrisch <[email protected]>
 Michael Droettboom <[email protected]> mdroe <mdroe@localhost>
 Michael  K. Tran  <[email protected]> mtran <[email protected]>
 Michael Martin <[email protected]> mmartin <[email protected]>
+Michael Schnaitter <[email protected]> schnaitterm <[email protected]>
 Nathaniel J. Smith <[email protected]> njsmith <[email protected]>
 Naveen Arunachalam <[email protected]> naveenarun <[email protected]>
 Nicolas Scheffer <[email protected]> Nicolas Scheffer <[email protected]>
+Nicholas A. Del Grosso <[email protected]> nickdg <[email protected]>
 Ondřej Čertík <[email protected]> Ondrej Certik <[email protected]>
 Óscar Villellas Guillén <[email protected]> ovillellas <[email protected]>
 Pat Miller <patmiller@localhost> patmiller <patmiller@localhost>
@@ -171,3 +175,4 @@ Wendell Smith <[email protected]> Wendell Smith <[email protected]>
 William Spotz <[email protected]@localhost> [email protected] <[email protected]@localhost>
 Wojtek Ruszczewski <[email protected]> wrwrwr <[email protected]>
 Zixu Zhao <[email protected]> ZZhaoTireless <[email protected]>
+Ziyan Zhou<[email protected]> Ziyan <[email protected]>