strict analysis on Travis, Test on oldest supported SDK (#114)

diff --git a/.travis.yml b/.travis.yml
index 4e8126d..342c835 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: dart
 
 dart:
+  - 2.0.0
   - dev
 
 dart_task:
@@ -8,7 +9,7 @@
   # No parallelism on Firefox (-j 1)
   # Causes flakiness – need to investigate
   - test: --platform firefox -j 1
-  - dartanalyzer
+  - dartanalyzer: --fatal-infos --fatal-warnings .
 
 matrix:
   include: