added Nicolas to the list of mergers for the new var dumper component
minor #4275 added Nicolas to the list of mergers for the new var dumper component (fabpot)

This PR was merged into the master branch.

Discussion
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added Nicolas to the list of mergers for the new var dumper component

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | 2.6+
| Fixed tickets | n/a

Commits
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881f8d8 added Nicolas to the list of mergers for the new var dumper component
Clarifying some language
Created August CHANGELOG
Updated documentation regarding the SecurityContext split; symfony/symfony#11690