[Security] Bump stringstream from 0.0.5 to 0.0.6
[Security] Bump stringstream from 0.0.5 to 0.0.6

Bumps [stringstream](https://github.com/mhart/StringStream) from 0.0.5 to 0.0.6. **This update includes security fixes.**
- [Release notes](https://github.com/mhart/StringStream/releases)
- [Commits](https://github.com/mhart/StringStream/compare/v0.0.5...v0.0.6)
elixirscript/elixirscript,bryanjos/elixirscript