Require server v0.0.2 (#551)

This has the same relaxed SDK constraint

Author: DanTup

packages/devtools/pubspec.yaml

@@ -14,7 +14,7 @@ environment:
 dependencies:
   codemirror: ^0.5.3
   collection: ^1.14.11
-  devtools_server: ^0.0.1
+  devtools_server: ^0.0.2
   http: ^0.12.0+1
   intl: ^0.15.0
   js: ^0.6.1+1