remove GPL (#3373)

diff --git a/LICENSE b/LICENSE
index 7129002..360aa7f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -311,8 +311,6 @@
       -> third_party/python/cpplint/cpplint.py
     d3(v3.4.11, https://github.com/d3/d3/blob/master/LICENSE)
       -> heron/tools/ui/resources/static/js/d3.min.3.4.11.js
-    Sizzle(https://github.com/jquery/sizzle/blob/master/LICENSE.txt)
-          -> heron/shell/assets/jquery.js
 
 ========================================================================
 Third party Boost Software License, Version 1.0 licenses
@@ -324,12 +322,4 @@
     kashmir(https://github.com/Corvusoft/kashmir-dependency/blob/master/LICENSE_1_0.txt)
       -> third_party/kashmir/*
 
-========================================================================
-Third party GNU General Public License, Version 3.0 licenses
-========================================================================
 
-The following components are provided under the GNU General Public License, Version 3.0.
-See project link for details.
-
-    Sizzle(https://github.com/jquery/sizzle/blob/master/LICENSE.txt)
-          -> heron/shell/assets/jquery.js
diff --git a/licenses/LICENSE-Sizzle.txt b/licenses/LICENSE-Sizzle.txt
new file mode 100644
index 0000000..d91f54b
--- /dev/null
+++ b/licenses/LICENSE-Sizzle.txt
@@ -0,0 +1,36 @@
+Copyright JS Foundation and other contributors, https://js.foundation/
+
+This software consists of voluntary contributions made by many
+individuals. For exact contribution history, see the revision history
+available at https://github.com/jquery/sizzle
+
+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.
\ No newline at end of file