Update slider.md (#218)
add version declaration for forbid-slide-animation of slider
diff --git a/source/references/components/slider.md b/source/references/components/slider.md
index 18377e2..b3b1342 100644
--- a/source/references/components/slider.md
+++ b/source/references/components/slider.md
@@ -26,7 +26,7 @@
- `infinite {boolean}`: set whether the page in the slider can be scrolled
- `scrollable {boolean}`: set whether slider pages can be switched by sliding gestures
- `keep-index {boolean}`: set whether to maintain the index of the page after the data changes
-- `forbid-slide-animation {boolean}`: {iOS Only}. On iOS animation is enabled by default, and here we provide this attribute to shutdown animation on iOS.
+- `forbid-slide-animation {boolean}`: <sup class="wx-v">0.21+ & iOS only</sup>. On iOS animation is enabled by default, and here we provide this attribute to shutdown animation on iOS.
- `index {number}`: specify current page index of slider
[try in dotWe](http://dotwe.org/vue/58a29d38247e7946a6db44e1b616f082)
