Build: Update license

Closes gh-67

Author: scottgonzalez

LICENSE-MIT

@@ -0,0 +1,37 @@
+Copyright 2012, 2014 jQuery Foundation and other contributors,
+https://jquery.org/
+
+This software consists of voluntary contributions made by many
+individuals. For exact contribution history, see the revision history
+available at https://github.com/jquery/jquery-migrate
+
+The following license applies to all parts of this software except as
+documented below:
+
+====
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+====
+
+All files located in the node_modules and external directories are
+externally maintained libraries used by this software which have their
+own licenses; we recommend you read them, as their terms may differ from
+the terms above.

LICENSE.txt

@@ -18,7 +18,7 @@
 	"licenses": [
 		{
 			"type": "MIT",
-			"url": "https://github.com/jquery/jquery-migrate/blob/master/LICENSE-MIT"
+			"url": "https://github.com/jquery/jquery-migrate/blob/master/LICENSE.txt"
 		}
 	],
 	"dependencies": {