dictionary-et@2.0.0 license notice

The upstream package README states:

Dictionary and affix file: LGPL-2.1.
Rest: MIT (c) Titus Wormer.

Only `index.aff` and `index.dic` are vendored in this directory, so the
dictionary and affix files are licensed under the GNU Lesser General Public
License version 2.1.

Source package: https://www.npmjs.com/package/dictionary-et/v/2.0.0
Upstream source: http://www.meso.ee/~jjpp/speller
LGPL-2.1 text: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html