[+] Doc updated

Author: hi-manshu

README.md

@@ -5,7 +5,7 @@
 Radial ProgressBar inspired  by Apple Watch OS. It is highly Customisable <br/>
 ### Preview of Radial Progress Bar
 
- <img src="https://github.com/MindorksOpenSource/RadialProgressBar/blob/master/images/slow.gif" width ="200" height ="200"/>
+ <img src="https://github.com/MindorksOpenSource/RadialProgressBar/blob/master/images/slow.gif" width ="300" height ="300"/>
 <img src="https://images-na.ssl-images-amazon.com/images/I/51FRMHVcPcL._SX425_.jpg"  width ="200" height ="200"/>