cross build using sbt 0.13.16-M1

.travis.yml

@@ -1,4 +1,10 @@
 language: scala
 sudo: false
-script: sbt test
 jdk: oraclejdk8
+
+env:
+  matrix:
+    - SBT_CMD="test"
+    - SBT_CMD="++2.12.2 ^^1.0.0-M6 test"
+
+script: sbt "$SBT_CMD"

build.sbt

@@ -35,9 +35,3 @@ lazy val root = (project in file("."))
       "org.slf4j" % "slf4j-nop" % "1.7.7"), // https://github.com/softprops/bintray-sbt/issues/26
     resolvers += Resolver.sonatypeRepo("releases")
   )
-  .settings(
-    scalaVersion := "2.12.2",
-    sbtVersion in Global := "1.0.0-M5",
-    scalaCompilerBridgeSource :=
-      ("org.scala-sbt" % "compiler-interface" % "0.13.15" % "component").sources
-  )

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.15
+sbt.version=0.13.16-M1