Fix v2.2.7 release date in the changelog.

[gmajoulet]

Fix v2.2.7 release date in the changelog.

I hate being that guy who sends one line PRs to update the doc, but I installed the beta 2.3 version instead of the stable 2.2.7 because I thought it was one year old... before checking again.

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[parity-cla-bot]

It looks like @gmajoulet hasn't signed our Contributor License Agreement, yet.

The purpose of a CLA is to ensure that the guardian of a project's outputs has the necessary ownership or grants of rights over all contributions to allow them to distribute under the chosen licence.
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Many thanks,

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[gmajoulet]

[clabot:check]

[parity-cla-bot]

It looks like @gmajoulet signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot

[parity-cla-bot]

It looks like @gmajoulet signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot