Use Tables in README

The eternal oddball, it would appear that GitHub Flavored Markdown supports tables.

[Platforms section](https://github.com/hybridgroup/cylon/blob/edc98c009da2cea4f6722d90fb554ef236434935/README.markdown#hardware-support)

[Version History section](https://github.com/hybridgroup/cylon/blob/edc98c009da2cea4f6722d90fb554ef236434935/README.markdown#release-history)

May or may not be a better solution, I at least find it easier to read.