fix(package): fix package.json trailing commas.
fix(package): fix package.json trailing commas.

npm fails to install dependencies when there are trailing commas at the last item of arrays.

deepstreamIO/golden-layout,golden-layout/golden-layout,jcford73/golden-layout,deepstreamIO/golden-layout,deepstreamIO/golden-layout,Liplattaa/liplattaa-golden-layout,LarissaSmith/golden-layout,golden-layout/golden-layout,golden-layout/golden-layout,LarissaSmith/golden-layout,jcford73/golden-layout,Liplattaa/liplattaa-golden-layout