Format cli_util.dart

lib/cli_util.dart

@@ -73,7 +73,7 @@ String _requireEnv(String name) =>
 
 /// Exception thrown if a required environment entry does not exist.
 ///
-/// Thrown by [applicationConfigHome] if an expected and required 
+/// Thrown by [applicationConfigHome] if an expected and required
 /// platform specific environment entry is not available.
 class EnvironmentNotFoundException implements Exception {
   /// Name of environment entry which was needed, but not found.