Merge pull request #18 from regadas/chore/jdk11

Add openjdk11

Author: alexarchambault

.travis.yml

@@ -1,5 +1,12 @@
 language: java
-jdk: openjdk8
+
+jdk:
+  - openjdk8
+  - openjdk11
+env:
+  - SCALA_VERSION=2.13.1
+  - SCALA_VERSION=2.12.11
+  - SCALA_VERSION=2.11.12
 
 branches:
   only:
@@ -25,10 +32,8 @@ stages:
 script: sbt ++$SCALA_VERSION test test-proj-v1/publishLocal test-proj-v2/mimaReportBinaryIssues proj-v1-user/compile
 jobs:
   include:
-  - env: SCALA_VERSION=2.13.1
-  - env: SCALA_VERSION=2.12.11
-  - env: SCALA_VERSION=2.11.12
   - name: formatting
     script: scalafmt --test
   - stage: release
     script: sbt ci-release
+    jdk: openjdk11

project/Settings.scala

@@ -29,7 +29,10 @@ object Settings {
       if (isScala211Or212.value) Nil
       else List("-Ymacro-annotations")
     },
-    scalacOptions += "-deprecation"
+    scalacOptions ++= Seq(
+      "-target:jvm-1.8",
+      "-deprecation"
+    )
   )
 
 }