[fuchsia-logger] Fixing logger deps version

Dart versions have three fields.

Change-Id: I0636689e2a03730bafe2b22287dd2fd9b4281049
diff --git a/public/dart/fuchsia_logger/pubspec.yaml b/public/dart/fuchsia_logger/pubspec.yaml
index d19d16f..340650b 100644
--- a/public/dart/fuchsia_logger/pubspec.yaml
+++ b/public/dart/fuchsia_logger/pubspec.yaml
@@ -7,4 +7,4 @@
   sdk: '>=2.0.0 <3.0.0'
 
 dependencies:
-  logging: ^0.11
+  logging: ^0.11.0