LGPL3 recognised as GPL3

[leslielazzarino]

Description

The header of a file in an older version of pyzmq gets recognized as GPL3, as the word "lesser" in the text gets ignored.
PS: I've got already a fix by adding a new rule, I'm gonna open a PR soon.

How To Reproduce

Tell us how to reproduce the issue.

Create a test file with the following content:
# pyzmq is free software; you can redistribute it and/or modify it under
# the terms of the Lesser GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# pyzmq is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# Lesser GNU General Public License for more details.
#
# You should have received a copy of the Lesser GNU General Public License
# along with this program. If not, see http://www.gnu.org/licenses/.

Then run e.g. the current version of scan code on the develop branch:
scancode -clpu --only-findings --license-text --verbose --json-pp results.json test.pxd

The results will contain only gpl-3.0-plus, due to gpl-3.0-plus_27.RULE being triggered.

System configuration

• What OS are you running on? Same results on Windows and Linux
• What version of scancode-toolkit was used to generate the scan file? develop branch
• What installation method was used to install/run scancode? source download