Bump symfony/flex from 1.0.60 to 1.0.61
Bump symfony/flex from 1.0.60 to 1.0.61

Bumps [symfony/flex](https://github.com/symfony/flex) from 1.0.60 to 1.0.61.
- [Commits](https://github.com/symfony/flex/compare/v1.0.60...v1.0.61)
deathart/Forum,deathart/Forum,deathart/Forum