Add MIT license text

Author: marijnh

code/LICENSE

@@ -0,0 +1,19 @@
+Copyright (C) 2008-2020 by Marijn Haverbeke <[email protected]>
+
+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.

epub/frontmatter.xhtml

@@ -15,7 +15,7 @@
     a <a href="https://creativecommons.org/licenses/by-nc/3.0/">Creative
     Commons attribution-noncommercial license</a>. All code in this book
     may also be considered licensed under
-    an <a href="https://opensource.org/licenses/MIT">MIT license</a>.</p>
+    an <a href="https://eloquentjavascript.net/code/LICENSE">MIT license</a>.</p>
 
     <p style="font-size: 80%">Illustrations by various artists: Cover
     and chapter illustrations by Madalina Tantareanu. Pixel art in

html/index.html

@@ -41,7 +41,7 @@ <h1>Eloquent JavaScript<div style="font-size: 70%">3rd edition</div></h2>
   a <a href="https://creativecommons.org/licenses/by-nc/3.0/">Creative
   Commons attribution-noncommercial license</a>. All code in this book
   may also be considered licensed under
-  an <a href="https://opensource.org/licenses/MIT">MIT license</a>.</p>
+  an <a href="https://eloquentjavascript.net/code/LICENSE">MIT license</a>.</p>
 
   <p>Illustrations by various artists: Cover and chapter illustrations
   by <a href="http://madalinatantareanu.com/">Madalina Tantareanu</a>.

pdf/book.tex

@@ -95,7 +95,7 @@
   attribution-noncommercial license
   (\url{http://creativecommons.org/licenses/by-nc/3.0/}). All code in
   the book may also be considered licensed under an MIT license
-  (\url{http://opensource.org/licenses/MIT}).
+  (\url{https://eloquentjavascript.net/code/LICENSE}).
 
   The illustrations are contributed by various artists: Cover and
   chapter illustrations by Madalina Tantareanu. Pixel art in Chapters