docs: add jsbin demo

Author: BuptStEve

.github/ISSUE_TEMPLATE/bug_report.md

@@ -22,6 +22,7 @@ Steps to reproduce the behavior:
 
 Providing a reproduction demo will be better(you can pick a platform below and **fork** the demo):
 
+* jsbin: https://jsbin.com/cafiful/edit?output
 * codepen: https://codepen.io/buptsteve/pen/PvNQjP
 * jsfiddle: https://jsfiddle.net/buptsteve/6u8g3Lf5/
 * codesandbox: https://codesandbox.io/s/o73z4jy5q9

.github/ISSUE_TEMPLATE/bug_report_cn.md

@@ -23,6 +23,7 @@ Version [e.g. 0.1.0]
 
 建议 **fork** 以下某个平台的 demo 复现一下：
 
+* jsbin: https://jsbin.com/cafiful/edit?output
 * codepen: https://codepen.io/buptsteve/pen/PvNQjP
 * jsfiddle: https://jsfiddle.net/buptsteve/6u8g3Lf5/
 * codesandbox: https://codesandbox.io/s/o73z4jy5q9

.github/PULL_REQUEST_TEMPLATE.md

@@ -27,6 +27,7 @@ You have tested in the following platforms:
 
 Providing a reproduction demo will be better(you can pick a platform below and **fork** the demo):
 
+* jsbin: https://jsbin.com/cafiful/edit?output
 * codepen: https://codepen.io/buptsteve/pen/PvNQjP
 * jsfiddle: https://jsfiddle.net/buptsteve/6u8g3Lf5/
 * codesandbox: https://codesandbox.io/s/o73z4jy5q9