.travis.yml in ffi-openmpt-0.3.0 vs .travis.yml in ffi-openmpt-0.4.0

@@ -2,19 +2,19 @@
 language: ruby
 
 cache: bundler
 
 before_install:
-  - gem install bundler -v 1.16.1
+  - gem install bundler -v 2.0.1
   - ./test/install-libopenmpt.sh
   - export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TRAVIS_BUILD_DIR/usr/lib
 
 rvm:
-  - 2.2.10
   - 2.3.8
   - 2.4.5
-  - 2.5.3
+  - 2.5.5
+  - 2.6.2
   - rbx-3
   - ruby-head
 
 env:
   - TEST_LIBOPENMPT_VERSION=0.3.11
@@ -26,10 +26,8 @@
     - rvm: rbx-3
     - rvm: ruby-head
     - env: TEST_LIBOPENMPT_VERSION=0.3.12
   exclude:
     - rvm: rbx-3
-      env: TEST_LIBOPENMPT_VERSION=0.3.12
-    - rvm: 2.2.10
       env: TEST_LIBOPENMPT_VERSION=0.3.12
     - rvm: 2.3.8
       env: TEST_LIBOPENMPT_VERSION=0.3.12