.travis.yml in rasti-db-0.4.1 vs .travis.yml in rasti-db-1.0.0

@@ -1,23 +1,27 @@
 language: ruby
 
 rvm:
-  - 1.9.3
   - 2.0
   - 2.1
   - 2.2
   - 2.3.0
   - 2.4.0
   - 2.5.0
-  - jruby-1.7.25
+  - 2.6.0
   - jruby-9.1.7.0
+  - jruby-9.1.16.0
   - ruby-head
   - jruby-head
 
 matrix:
   fast_finish: true
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
 
+jdk:
+  - openjdk8
+
 before_install:
-  - gem install bundler
+  - rvm all-gemsets do gem uninstall bundler -ax || true
+  - gem install bundler -v "< 2"
\ No newline at end of file