Update README.md

Author: mandliya

README.md

@@ -7,7 +7,7 @@
 | Current Status|     Stats     |
 | :------------: | :----------: |
 | Total C++ Problems | 188 |
-| Total Python Problems | 12 |
+| Total Python Problems | 13 |
 | Current Daily Streak| 8 |
 | Last Streak | 06/20/2019 - 06/21/2019|
 | Current Streak | 06/23/2019 - 06/30/2019|