.travis.yml in eps-0.1.0 vs .travis.yml in eps-0.1.1

@@ -1,8 +1,11 @@
 language: ruby
 rvm: 2.5.1
-sudo: false
-before_install: gem install bundler
+sudo: required
+before_install:
+  - gem install bundler
+  - sudo apt-get update
+  - sudo apt-get install -y libgsl0-dev
 script: bundle exec rake test
 env:
   -
   - GSL=t
 notifications: