.travis.yml in fillable-pdf-0.7 vs .travis.yml in fillable-pdf-0.7.1

@@ -2,6 +2,9 @@
 sudo: false
 language: ruby
 cache: bundler
 rvm:
   - 2.6.4
-before_install: gem install bundler -v 2.0.2
+jdk:
+  - openjdk8
+before_install:
+  - gem install bundler -v 2.0.2
\ No newline at end of file