allow JDK 13/14 build

note that the Travis-CI changes don't make the JDK 6 build
work, but they do allow the JDK 8 one to run

Author: SethTisue

.travis.yml

@@ -23,14 +23,9 @@ env:
 
 script: admin/build.sh
 
-addons:
-  apt:
-    packages:
-      - openjdk-6-jdk
-
 jdk:
   - openjdk6
-  - oraclejdk8
+  - openjdk8
 
 notifications:
   email:

build.sbt

@@ -12,7 +12,9 @@ scalaVersionsByJvm in ThisBuild := {
     9 -> List(v212 -> false, v213 -> false, v211 -> false),
     10 -> List(v212 -> false, v213 -> false, v211 -> false),
     11 -> List(v212 -> false, v213 -> false, v211 -> false),
-    12 -> List(v212 -> false, v213 -> false, v211 -> false)
+    12 -> List(v212 -> false, v213 -> false, v211 -> false),
+    13 -> List(v212 -> false, v213 -> false, v211 -> false),
+    14 -> List(v212 -> false, v213 -> false, v211 -> false)
   )
 }
 

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.17
+sbt.version=0.13.18