Update README.md

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Add warning due to bug

Fix `unsplit` error complaining about duplicated rownames when dealing with a panel without data.

roxygenize

Update README with scale transformation example

Merge pull request #9 from teunbrand/master

Added scale transformations tests

Added support for scale transformations

Require ggplot2 >= 3.2.0, and remove some ggplot private functions

Fix typo in documentation

Merge remote-tracking branch 'ravenroadresources/master'

Update facet_grid_sc to the latest ggplot2 changes

Using Roxygen 6.1.1