Rename licence file for detection by GitHub

[hugovk]

GitHub looks for a LICENSE file:

Re: https://docs.github.com/en/rest/licenses?apiVersion=2022-11-28

Now, gh api -H "Accept: application/vnd.github+json" /repos/jazzband/prettytable returns:

...
  "license": {
    "key": "other",
    "name": "Other",
    "spdx_id": "NOASSERTION",
    "url": null,
    "node_id": "MDc6TGljZW5zZTA="
  },
...

[codecov[bot]]

Codecov Report

Merging #229 (d1ce536) into main (599bb88) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   94.38%   94.38%           
=======================================
  Files           5        5           
  Lines        2281     2281           
=======================================
  Hits         2153     2153           
  Misses        128      128           

Flag	Coverage Δ
macos-latest	94.34% <ø> (ø)
ubuntu-latest	94.34% <ø> (ø)
windows-latest	94.30% <ø> (ø)

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[hugovk]

Hmm, needs some more massaging:

  "license": {
    "key": "other",
    "name": "Other",
    "spdx_id": "NOASSERTION",
    "url": null,
    "node_id": "MDc6TGljZW5zZTA="
  },