License in package.xml

[shr-project]

Can you please include the license version in package.xml?

Currently
https://github.com/ANYbotics/rqt_multiplot_plugin/blob/master/rqt_multiplot/package.xml#L12
says only LGPL, while:
https://github.com/ANYbotics/rqt_multiplot_plugin/blob/master/LICENSE
says LGPL-3.0

superflore maps this to LGPL-2 in:
https://github.com/ros-infrastructure/superflore/blob/master/superflore/utils.py#L179
and LGPL-2 isn't valid SPDX Identifier in:
https://spdx.org/licenses/
and doesn't really match your license, so it would be better to declare the license correctly at the source - in package.xml.