Update floats source css

[lachlanjc]

There seems to have been a discrepancy between the real css from floats and the source css in the docs. Fixed it here. Btw, is there a script to update all these automatically?

[johno]

Nice catch. The docs are built from the src/css files. Right now I believe @mrmrs has been manually cping those files from the tachyons repo. I've been meaning to create a script to automatically copy them over from node_modules/tachyons/src as part of the build process (allowing us to update simply by installing the latest tachyons version), however I haven't gotten around to it.

[lachlanjc]

Makes sense @johnotander. Thanks!