Install JDK from jabba (#200)

This is a first step in releasing from travis, #128

Author: raboof

.travis.yml

@@ -1,36 +1,58 @@
 language: scala
 
-jdk:
-  - openjdk8
-  - openjdk11
-
 env:
   - SCALA_VERSION=2.11.6
+    [email protected]
   - SCALA_VERSION=2.11.7
+    [email protected]
   - SCALA_VERSION=2.11.8
+    [email protected]
   - SCALA_VERSION=2.11.11
+    [email protected]
+  # 2.11.12 was the first Scala 2.11.x version to work on jdk11
+  - SCALA_VERSION=2.11.12
+    [email protected]
   - SCALA_VERSION=2.11.12
+    [email protected]
+  - SCALA_VERSION=2.12.3
+    [email protected]
   - SCALA_VERSION=2.12.3
+    [email protected]
   - SCALA_VERSION=2.12.4
+    [email protected]
+  - SCALA_VERSION=2.12.4
+    [email protected]
+  - SCALA_VERSION=2.12.6
+    [email protected]
   - SCALA_VERSION=2.12.6
+    [email protected]
+  - SCALA_VERSION=2.12.7
+    [email protected]
   - SCALA_VERSION=2.12.7
+    [email protected]
   - SCALA_VERSION=2.12.8
+    [email protected]
+  - SCALA_VERSION=2.12.8
+    [email protected]
+  - SCALA_VERSION=2.12.9
+    [email protected]
   - SCALA_VERSION=2.12.9
+    [email protected]
+  - SCALA_VERSION=2.12.10
+    [email protected]
   - SCALA_VERSION=2.12.10
+    [email protected]
   - SCALA_VERSION=2.13.0
+    [email protected]
+  - SCALA_VERSION=2.13.0
+    [email protected]
+  - SCALA_VERSION=2.13.1
+    [email protected]
   - SCALA_VERSION=2.13.1
+    [email protected]
 
-# 2.11.12 was the first Scala 2.11.x version to work on jdk11
-matrix:
-  exclude:
-    - jdk: openjdk11
-      env: SCALA_VERSION=2.11.6
-    - jdk: openjdk11
-      env: SCALA_VERSION=2.11.7
-    - jdk: openjdk11
-      env: SCALA_VERSION=2.11.8
-    - jdk: openjdk11
-      env: SCALA_VERSION=2.11.11
+before_install: curl -Ls https://git.io/jabba | bash && . ~/.jabba/jabba.sh
+install: jabba install "$TRAVIS_JDK" && jabba use "$_" && java -Xmx32m -version
 
 script:
   # Increasing ReservedCodeCacheSize minimizes scala compiler-interface compile times