Use coursier-based sbt launcher

.travis.yml

@@ -4,7 +4,9 @@ jdk: openjdk8
 git:
   depth: false # https://stackoverflow.com/a/51727114/3714539
 before_install:
-  - mkdir .bin && curl -Lo .bin/sbt https://raw.githubusercontent.com/paulp/sbt-extras/a56bf05b1113e251aeaf7542f48c45c6c2691d4d/sbt
+  - mkdir .bin
+  - curl -Lo .bin/sbt https://raw.githubusercontent.com/coursier/sbt-extras/77c93346a2b52cf35cc72382125cfdbb25a00197/sbt
+  - chmod +x .bin/sbt
   - export PATH="$(pwd)/.bin:$PATH"
   - export TRAVIS_SCALA_VERSION=2.12.8
 script: scripts/travis.sh

appveyor.yml

@@ -2,18 +2,12 @@
 version: '{build}'
 os: Windows Server 2012
 install:
-  - ps: |
-      Add-Type -AssemblyName System.IO.Compression.FileSystem
-      if (!(Test-Path -Path "C:\sbt" )) {
-        (new-object System.Net.WebClient).DownloadFile(
-          'https://dl.bintray.com/sbt/native-packages/sbt/0.13.8/sbt-0.13.8.zip',
-          'C:\sbt-bin.zip'
-        )
-        [System.IO.Compression.ZipFile]::ExtractToDirectory("C:\sbt-bin.zip", "C:\sbt")
-      }
+  - cmd: mkdir C:\sbt
+  - cmd: curl -Lo C:\sbt\sbt https://github.com/coursier/sbt-launcher/releases/download/v1.2.5/csbt
+  - cmd: curl -Lo C:\sbt\sbt.bat https://github.com/coursier/sbt-launcher/releases/download/v1.2.5/csbt.bat
   - cmd: SET JAVA_HOME=C:\Program Files\Java\jdk1.8.0
-  - cmd: SET PATH=C:\sbt\sbt\bin;%JAVA_HOME%\bin;%PATH%
-  - cmd: SET SBT_OPTS=-Xmx4g -Xss2m
+  - cmd: SET PATH=C:\sbt;%JAVA_HOME%\bin;%PATH%
+  - cmd: SET JAVA_OPTS=-Xmx4g -Xss2m
   - git submodule update --init --recursive
 environment:
   TEST_REPOSITORY_HOST: localhost

project/Settings.scala

@@ -42,7 +42,8 @@ object Settings {
         "-Xmx1024M",
         "-Dplugin.name=" + name.value,
         "-Dplugin.version=" + version.value,
-        "-Dsbttest.base=" + (sourceDirectory.value / "sbt-test").getAbsolutePath
+        "-Dsbttest.base=" + (sourceDirectory.value / "sbt-test").getAbsolutePath,
+        "-Dcoursier.sbt-launcher.add-plugin=false"
       ),
       scriptedBufferLog := false,
       sbtPlugin := true,