Update README.md

Author: Shauryaditya

ConnectFour/README.md

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 # Connect Four
 ![ConnectFour](https://user-images.githubusercontent.com/68684482/124650666-98456c00-deb7-11eb-80e7-87e999d8ab96.png)
 
-### This is a simple game which can be played between two players.The player who connects the four bubbles first wins the game . The bubbles could be connected horizontally , vertically or diagonally.
+### This is a simple game which can be played between two players.The player who connects the four bubbles first wins the game . The bubbles could be connected horizontally , vertically or diagonally.The players have to be together since multiplayer feature is not available