Update coursier version

Author: cquiroz

project/plugins.sbt

@@ -2,7 +2,7 @@ resolvers += Resolver.sonatypeRepo("public")
 
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.13")
 addSbtPlugin("io.github.soc" % "sbt-testng" % "4.0.0-M3")
-addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-M14-7")
+addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-M15")
 
 addSbtPlugin("com.fortysevendeg"  % "sbt-microsites" % "0.3.3")