Automatic Detection of Disparities between -Koa and -Express Adaptors

[Furchin]

This is a harder more open-ended issue, but it would be lovely to come up with some mechanism to detect when https://github.com/builtforme/swatchjs-koa and https://github.com/builtforme/swatchjs-express are out of sync (and ideally other future adaptors too). Could be as simple as validation to ensure they both depend on the same version of SwatchJS.