Unable to download SBT-assembly 0.14.x due to jitpack build failures

[nvander1]

All of the four latest releases of sbt assembly 0.14.x on jitpack give an error about not being able to resolve dependency on sbt 0.13.x

• https://jitpack.io/com/github/sbt/sbt-assembly/v0.14.10/build.log
• https://jitpack.io/com/github/sbt/sbt-assembly/v0.14.9/build.log
• https://jitpack.io/com/github/sbt/sbt-assembly/v0.14.8/build.log
• https://jitpack.io/com/github/sbt/sbt-assembly/v0.14.7/build.log

@eed3si9n @xuwei-k @rjmac @jeroentervoorde

[frankivo]

See #425