Failed to resolve plugin sbt-lightbend-markdown

[dwijnand]

steps

sbt version: 1.3.0-RC2

problem

• Take https://github.com/lagom/lagom/tree/04ef1b9bebbad1d4c66481decc643edc63190a13/docs
• Upgrade to sbt 1.3.0-RC2 (aka sbt 1.3.0-RC2 lagom/lagom#1996)
• Load the build

[warn] 	Note: Some unresolved dependencies have extra attributes.  Check that these dependencies exist with the requested attributes.
[warn] 		com.lightbend.markdown:sbt-lightbend-markdown:1.7.0 (sbtVersion=1.0, scalaVersion=2.12)
[warn] 
[warn] 	Note: Unresolved dependencies path:
[error] sbt.librarymanagement.ResolveException: Error downloading com.lightbend.markdown:sbt-lightbend-markdown;sbtVersion=1.0;scalaVersion=2.12:1.7.0
[error]   Not found
[error]   not found: https://repo1.maven.org/maven2/com/lightbend/markdown/sbt-lightbend-markdown_2.12_1.0/1.7.0/sbt-lightbend-markdown-1.7.0.pom
[error]   not found: /home/travis/.ivy2/local/com.lightbend.markdown/sbt-lightbend-markdown/scala_2.12/sbt_1.0/1.7.0/ivys/ivy.xml
[error]   not found: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.lightbend.markdown/sbt-lightbend-markdown/scala_2.12/sbt_1.0/1.7.0/ivys/ivy.xml

expectation

Build loads, doc tests pass.

[eed3si9n]

Opened lightbend/lightbend-markdown#14, and this is basically the same story as #4698 / #4827, so I am going to close this as duplicate.