useState broken when work with useContext

[afc163]

Status	reproduce	version	useContext?
❌	https://codesandbox.io/s/orqqpwoqz	react-with-hooks@1.1.6	true
✅	https://codesandbox.io/s/k50r9wz745	react-with-hooks@1.1.6	false
✅	https://codesandbox.io/s/jnoy3myvk5	react-with-hooks@1.1.4	true

[yesmeck]

看起来 useContext 是没法从外部实现了，1.1.4 能在这个场景下工作，但是有多个 useContext 就会出错