Merge pull request #444 from Tencent/fix/progress/demo

fix(progress): [demo] control percentage value is in [0, 100]

Author: LeeJim

src/progress/_example/progress.ts

@@ -5,7 +5,7 @@ Page({
 
   clickAdd() {
     this.setData({
-      percentage: this.data.percentage + 10,
+      percentage: Math.min(this.data.percentage + 10, 100),
     });
   },