- Changed dependency on kriswallsmith/buzz to 0.7 or later

Please change the dependency version. It's a bad idea to require a specific version as other bundles are referencing kriswallsmith/buzz, too. Some of them require dev-master, which is incompatible with 0.7. Composer will report errors, so you can't even install the bundles. Depending on 0.7 or later should be fine.