Update travis config
diff --git a/.travis.yml b/.travis.yml
index 5052773..f3af868 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,10 @@
+sudo: false
 language: erlang
 notifications:
   email: false
 otp_release:
-  - 17.4
-  - 17.3
+  - 18.2.1
+  - 18.1
+  - 17.5
   - R16B03-1
   - R15B03