Can't resolve snappy-java-1.1.1.6.jar via coursier

[moradology]

The artifact fetching plugin Coursier is incapable of retrieving snappy-java-1.1.1.6.jar. Here's the error message:

geotrellis-backend > assembly
[trace] Stack trace suppressed: run last geotrellis-backend/*:update for the full output.
[error] (geotrellis-backend/*:update) coursier.ResolutionException: 1 not found
[error]   /Users/nzimmerman/.m2/repository/org/xerial/snappy/snappy-java/1.1.1.6/snappy-java-1.1.1.6.jar
[error] Total time: 1 s, completed Feb 23, 2017 2:16:44 PM