Fix text rendering, update dependencies for new purescript

[marcusbuffett]

Tried to use this to convert Streamline icons recently and had a couple stumbling blocks. Fixed the text node rendering to wrap stuff in quotes, and updated dependencies so the project builds with latest purescript. I have purty installed so it looks like a lot of changes in Render.purs but the only real change is:

 renderSvgNode _ (SvgText str) = "text " <> "\"\"\"" <> str <> "\"\"\""

[marcusbuffett]

Oh and thank you for creating this! Saved me a lot of trouble trying to embed the svgs myself

[rnons]

Hi, thanks for your pull request. Do you mind reverting the changes introduced by purty? I haven't tried purty yet. I'm more familiar with the old formatting, and will work on #1 some time, which may introduce some inconsistency with purty formatting.