Merge pull request #2811 from cwtuan/patch-1

chore: Add npm Downloads Trend Image to README

Author: adumesny

README.md

@@ -536,7 +536,11 @@ View our change log [here](https://github.com/gridstack/gridstack.js/tree/master
 
 # Usage Trend
 
+[Usage Trend of gridstack](https://npm-compare.com/gridstack#timeRange=THREE_YEARS)
+  
+<a href="https://npm-compare.com/gridstack#timeRange=THREE_YEARS" target="_blank">
   <img src="https://npm-compare.com/img/npm-trend/THREE_YEARS/gridstack.png" width="70%" alt="NPM Usage Trend of gridstack" />
+</a>
 
 # The Team