Update travis configuration

Author: mmarx

.editorconfig

@@ -11,3 +11,6 @@ trim_trailing_whitespace = true
 [*.md]
 trim_trailing_whitespace = false
 insert_final_newline = false
+
+[*.yml]
+indent_style = space

.travis.yml

@@ -1,21 +1,35 @@
 language: java
-jdk:
-  - openjdk8
-#  - oraclejdk8
-#  - oraclejdk9
+matrix:
+    include:
+        - os: linux
+          dist: bionic
+          jdk:
+              - openjdk11
+
+        - os: linux
+          dist: trusty
+          addons:
+              apt:
+                  sources:
+                      - ubuntu-toolchain-r-test
+                  packages:
+                      - g++-7
+          jdk:
+              - openjdk8
+
+        - os: osx
+
 
 ## Uncomment section below and the packages above to build unreleased snapshots of karmaresearch/vlog into vlog4j-base jar
-#before_install:
- # - sudo apt-get install gcc-5 -y
- # - eval “CC=gcc-5 && CXX=g++-5”
- # - sh ./build-vlog-library.sh
+before_install:
+ - sh ./build-vlog-library.sh
 
 install: mvn install $OPTIONS -DskipTests=true
 
 after_success:
   - mvn clean test jacoco:report coveralls:report
 
-dist: trusty
+dist: bionic
 sudo: false
 
 cache: