modify the README.md

Author: wenmin-wu

README.md

@@ -1,10 +1,14 @@
-#RTB Algorihtms
+RTB Algorihtms
+======
+
 RTB Algorihtms is a project which contains the implementations of algorithms about real-time bidding (RTB) based display advertising techniques.
 
-##Note
+###Note
+
 I'm a beginner of RTB and big data techniques, so don't hesitate to point out any problem of this project. They are the gradients for me to move forward, I'll be most grateful.
 
-##Algorihtms
+###Algorihtms
+
 | Fraud Detection  | Reference |
 | ------------- | ------------- |
 | CoVisitationClustering | Using Co-Visitation Networks For Classifying Non-Intentional Traffic |