update travis configuration

tjmahr · tjmahr · commit 16c9bc27163f · 2016-03-10T08:13:37.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,8 @@
-# Sample .travis.yml for R projects
-
 language: r
+r:
+  - oldrel
+  - release
+  - devel
+sudo: false
+cache: packages
 warnings_are_errors: true
-sudo: required
