minor symfony#12533 Changing my e-mail (michellesanver)

This PR was submitted for the master branch but it was merged into the 3.4 branch instead (closes symfony#12533).

Discussion
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Changing my e-mail

Changing my public e-mail to be my liip e-mail in Symfony and other "Liip contexts".

Commits
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a3a15ad Changing my e-mail

Author: OskarStark

contributing/code_of_conduct/care_team.rst

@@ -31,7 +31,7 @@ of them at once by emailing **care@symfony.com**:
 
 * **Michelle Sanver**
 
-  * *E-mail*: hello [at] michellesanver.com
+  * *E-mail*: michelle [at] liip.ch
   * *Twitter*: `@michellesanver <https://twitter.com/michellesanver>`_
   * *SymfonyConnect*: `michellesanver <https://connect.symfony.com/profile/michellesanver>`_