fix: added y variable in readme file

Author: 0PrashantYadav0

lib/node_modules/@stdlib/stats/base/dists/uniform/quantile/README.md

@@ -101,7 +101,7 @@ Returns a function for evaluating the quantile function of a [continuous uniform
 
 ```javascript
 var myquantile = quantile.factory( 0.0, 4.0 );
-y = myquantile( 0.8 );
+var y = myquantile( 0.8 );
 // returns 3.2
 ```