Roll dart2js_info to 0.5.5+2 (#24)

diff --git a/pubspec.yaml b/pubspec.yaml
index 1b1eed1..e50de60 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart2js_info
-version: 0.5.5+1
+version: 0.5.5+2
 description: >
   Libraries and tools to process data produced when running dart2js with
   --dump-info.