Update README.md

Author: MooneDrJune

README.md

@@ -3,7 +3,7 @@ This is the repo of the FREE `Python Trader's Excel Based Trade Terminal For Zer
 
 ### Watch The Youtube Video For More Details On How To Install & Use Finvasia Excel Trade Terminal V3
 <a href="http://www.youtube.com/watch?feature=player_embedded&v=mPLBCT_Cxbw" target="_blank">
- <img src=".assets/thumbnails/finvasia_ttv3_thumbnail.png" alt="Watch the video" width="1000" height="500" border="10" />
+ <img src=".assets/thumbnails/finvasia_ttv3_thumbnail.png" alt="Watch the video" width="1000" height="450" border="10" />
 </a>