Update Guzzle to 5.0
Update Guzzle to 5.0

Signed-off-by: Kévin Dunglas <60dd2208f9e77f1494860be18b32351d8423fe44@gmail.com>

stof/php-ovh,ByScripts/php-ovh,VincentCasse/php-ovh,stof/php-ovh,VincentCasse/php-ovh,VincentCasse/php-ovh,vedaman/ovh-api,ByScripts/php-ovh,vedaman/ovh-api