Source path for Scala.js is wrong

[steinybot]

I am using boopickle from Scala.js with Scala.js Bundler and the source map has invalid paths. I'm guessing it is coming from the published sjsir files.

For example:
https://raw.githubusercontent.com/suzaku-io/boopickle/v1.3.3/shared/src/main/scala/boopickle/Pickler.scala
should be:
https://raw.githubusercontent.com/suzaku-io/boopickle/v1.3.3/boopickle/shared/src/main/scala/boopickle/Pickler.scala

I'm trying to write a better webpack source-map loader which is capable of resolving these properly (better than what https://github.com/aappddeevv/scalajs-friendly-source-map-loader does).