Update README.md

Author: eugene-matvejev

README.md

@@ -23,10 +23,13 @@ npm test -- --coverage
 import overwriteObjectField from "node-object-field-resolver"
 
 ...
-let object = {xxx: 'value'}
+let object = {xxx: 'value'} -- given object
 
 object = overwriteObjectField('xxx.yyy', object, 'new value', '.');
 
-object // {xxx: { yyy: 'new value'} }
+object -- {xxx: { yyy: 'new value'} }
+
+can be used as well as:
+overwriteObjectField('xxx.yyy', object, 'new value') # as objects are passed as via reference and get modified in proccess
 
 ```