ReadMe: clean up

Author: devMEremenko

ReadMe.md

@@ -80,9 +80,8 @@ The framework that incudes **42** popular CocoaPods libraries and **70+** depend
 
 ## Contribution
 
-[Submit a pull request](https://github.com/devMEremenko/XcodeBenchmark/pulls) and add a row to the `Score` section (preferred).
-
-[Open an issue](https://github.com/devMEremenko/XcodeBenchmark/issues/new/choose) and include all info to fill the `Score` section if you cannot submit a pull request.
+- **Preferred:** [Submit a pull request](https://github.com/devMEremenko/XcodeBenchmark/pulls) and add a row to the `Score` section.  
+- [Open an issue](https://github.com/devMEremenko/XcodeBenchmark/issues/new/choose) and include all info to fill the `Score` section if you cannot submit a pull request.
 
 Make sure:
 - [All steps](https://github.com/devMEremenko/XcodeBenchmark#before-each-test) are performed