slogging winston does not work under webpack bundled scalajs program

[aappddeevv]

The issue appears to be in the slogging-winston:

 val winston = Dynamic.global.require("winston")

Under webpack, winston will not load under the global variable.

[jokade]

slogging 0.5.3 now supports loading the winston backend correctly as a module (require("winston")), see #25 (this requires scalaJSModuleKind := ModuleKind.CommonJSModule to be set in your build.sbt). This should also help with bundlers.