Avoid the use of composer Package::setExtras
bug #129 Avoid the use of composer Package::setExtras (romainneutron)

This PR was merged into the 3.0.x-dev branch.

Discussion
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Avoid the use of composer Package::setExtras

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Fixed tickets | #128
| License       | MIT

Commits
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8808017 Avoid the use of composer Package::setExtras