.travis.yml in async-rspec-1.12.0 vs .travis.yml in async-rspec-1.12.1

@@ -1,23 +1,19 @@
 language: ruby
-sudo: false
-dist: trusty
 cache: bundler
 
-before_script:
-  - gem update --system
-  - gem install bundler
-
 matrix:
   include:
     - rvm: 2.3
     - rvm: 2.4
     - rvm: 2.5
     - rvm: 2.6
+    - rvm: 2.6
+      env: COVERAGE=BriefSummary,Coveralls
+    - rvm: ruby-head
     - rvm: jruby-head
       env: JRUBY_OPTS="--debug -X+O"
-    - rvm: ruby-head
-    - rvm: rbx-3
+    - rvm: truffleruby
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx-3
+    - rvm: truffleruby