fix whitespace

Author: keertip

lib/src/package_utils.dart

@@ -24,4 +24,4 @@ String getPackageDescription(String directoryName) =>
   _getPubspec(directoryName)['description'];
 
 String getPackageVersion(String directoryName) =>
-  _getPubspec(directoryName)['version'];
+  _getPubspec(directoryName)['version'];