minor #168 Update README.rst (benoitMariaux)
minor #168 Update README.rst (benoitMariaux)

This PR was merged into the 2.0-dev branch.

Discussion
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Update README.rst

Because h2 tags do not have a .post class.

Commits
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6a04780 Update README.rst

moffe42/Goutte,georaldc/Goutte,FriendsOfPHP/Goutte,farhan4648gul/Goutte,jozhao/Goutte,2upmedia/Goutte,ferjflores/Goutte,sitesense/Goutte,viniciusferreira/Goutte,chrismoulton/Goutte