Merge pull request #4 from explore-node-js/eugene-matvejev-patch-1

update README.md

Author: eugene-matvejev

README.md

@@ -15,3 +15,14 @@ object = overwriteObjectField('xxx.yyy', object, 'new value', '.');
 object // {xxx: { yyy: 'new value'} }
 
 ```
+
+
+## software requirements
+ * node.js 6.9+ [with v8 enabled]
+ * npm 3+
+
+## used technologies
+ * jest
+ 
+## how to execute tests
+ * npm test