.travis.yml in async-process-1.2.0 vs .travis.yml in async-process-1.3.0

@@ -1,18 +1,19 @@
 language: ruby
 dist: xenial
 cache: bundler
 
-rvm:
-  - 2.3
-  - 2.4
-  - 2.5
-  - 2.6
-  - jruby-head
-  - ruby-head
-  - rbx-3
-
 matrix:
+  include:
+    - rvm: 2.5
+    - rvm: 2.6
+    - rvm: 2.7
+    - rvm: 2.6
+      env: COVERAGE=PartialSummary,Coveralls
+    - rvm: jruby-head
+      env: JRUBY_OPTS="--debug -X+O"
+    - rvm: truffleruby
+    - rvm: ruby-head
   allow_failures:
+    - rvm: truffleruby
     - rvm: ruby-head
     - rvm: jruby-head
-    - rvm: rbx-3