Fix SPDX license ID

[remicollet]

As LICENSE.TXT states:

either version 3 of the License, or (at your option) any later version.

[codecov-commenter]

Codecov Report

Merging #591 (921c9af) into main (2fb1c01) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #591   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files         128      128           
  Lines       27022    27022           
=======================================
  Hits        18735    18735           
  Misses       8287     8287           

Flag	Coverage Δ
php-5.3-ubuntu-latest	68.85% <ø> (+<0.01%)	:arrow_up:
php-5.4-ubuntu-latest	?
php-5.5-ubuntu-latest	68.85% <ø> (+<0.01%)	:arrow_up:
php-5.6-ubuntu-latest	68.91% <ø> (ø)
php-7.0-ubuntu-latest	71.59% <ø> (-0.01%)	:arrow_down:
php-7.1-ubuntu-latest	73.07% <ø> (ø)
php-7.2-ubuntu-latest	72.94% <ø> (-0.01%)	:arrow_down:
php-7.3-ubuntu-latest	72.94% <ø> (ø)
php-7.4-ubuntu-latest	72.93% <ø> (-0.01%)	:arrow_down:
php-8.0-ubuntu-latest	72.94% <ø> (-0.01%)	:arrow_down:
php-8.1-ubuntu-latest	72.94% <ø> (ø)
php-8.2-ubuntu-latest	72.94% <ø> (ø)
php-nightly-ubuntu-latest	72.94% <ø> (+<0.01%)	:arrow_up:

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