Update LICENSE to carve out third party licenses.

LICENSE

 Copyright (c) 2011-2017 GitLab B.V.
+With regard to the GitLab Software:
+
 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
@@ -17,3 +19,7 @@ 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.
+
+For all third party components incorporated into the GitLab Software, those 
+components are licensed under the original license provided by the owner of the 
+applicable component.
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