Use recommended analysis_options name, support Dart v2-dev, test on FF (#9)

diff --git a/.travis.yml b/.travis.yml
index 10d307b..3c25288 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@
     - $HOME/.pub-cache
 dart_task:
   - test: --platform vm
+  - test: --platform firefox
   - test: --platform dartium
     install_dartium: true
   - dartanalyzer
diff --git a/.analysis_options b/analysis_options.yaml
similarity index 100%
rename from .analysis_options
rename to analysis_options.yaml
diff --git a/pubspec.yaml b/pubspec.yaml
index e442f97..9f4c1c5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,11 +1,11 @@
 name: convert
-version: 2.0.1
+version: 2.0.2-dev
 description: Utilities for converting between data representations.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/convert
 
 environment:
-  sdk: '>=1.17.0-dev.6.2 <2.0.0'
+  sdk: '>=1.17.0 <2.0.0-dev.infinity'
 
 dependencies:
   charcode: '^1.1.0'