rename analysis_options; update sdk constraint

.gitignore

diff --git a/.gitignore b/.gitignore
index 938f99e..5652c58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@
 build
 .project
 .settings
+.packages
 pubspec.lock

analysis_options.yaml

diff --git a/.analysis_options b/analysis_options.yaml
similarity index 100%
rename from .analysis_options
rename to analysis_options.yaml

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index dfe777a..f705677 100755
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,9 +1,9 @@
 name: plugin
-version: 0.2.0
+version: 0.2.0+1
 author: Dart Team <misc@dartlang.org>
 description: Support for building plugins.
 homepage: https://github.com/dart-lang/plugin
 environment:
-  sdk: '>=1.0.0 <2.0.0'
+  sdk: '>=1.0.0 <2.0.0-dev.infinity'
 dev_dependencies:
   test: any