Update composer requirement to allow guzzle 3.6
merged branch profilsoft/master (PR #106)

This PR was squashed before being merged into the master branch (closes #106).

Discussion
----------

Update composer requirement to allow guzzle 3.6

Hello,

I updated the composer requirements to allow guzzle to version `3.6`, as some libraries require `>3.4`.

All unit tests are green.

PS: I also recompiled the `goutte.phar`.

Commits
-------

8d99d0d Update composer requirement to allow guzzle 3.6