doc: switch LICENSE from closure-linter to eslint

Ref: https://github.com/nodejs/node/pull/1539
PR-URL: https://github.com/nodejs/node/pull/3018
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com>

LICENSE

@@ -213,37 +213,28 @@ The externally maintained libraries used by Node.js are:
     IN THE SOFTWARE.
   """
 
-- Closure Linter is located at tools/closure_linter. Closure's license
-  follows:
+- ESLint is located at tools/eslint. ESLint's license follows:
   """
-    # Copyright (c) 2007, Google Inc.
-    # All rights reserved.
-    #
-    # Redistribution and use in source and binary forms, with or without
-    # modification, are permitted provided that the following conditions are
-    # met:
-    #
-    #     * Redistributions of source code must retain the above copyright
-    # notice, this list of conditions and the following disclaimer.
-    #     * Redistributions in binary form must reproduce the above
-    # copyright notice, this list of conditions and the following disclaimer
-    # in the documentation and/or other materials provided with the
-    # distribution.
-    #     * Neither the name of Google Inc. nor the names of its
-    # contributors may be used to endorse or promote products derived from
-    # this software without specific prior written permission.
-    #
-    # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-    # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-    # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-    # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-    # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-    # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-    # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-    # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-    # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-    # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+    ESLint
+    Copyright (c) 2013 Nicholas C. Zakas. All rights reserved.
+
+    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.
   """
 
 - python-gflags is located at tools/gflags.  Its license follows: