Issue title: onBlur event is not fired in Controller
 Issue body: **Describe the bug**
after updating from v116.69.203.115 onBlur event is not fired on Controller component

**To Reproduce**
1. Go to codesandbox link
2. Click on 'Input with controller'
3. change focus
4. event is not fired

**Codesandbox link (Required)**
https://codesandbox.io/s/billowing-firefly-5zc02?file=/src/App.js

**Expected behavior**
I expect the onBlur event to fire.

**Desktop (please complete the following information):**

- OS: Macos 10.15.6
- Browser Chrome 84
- Version 6.6.0

 Comments: 
 Comment 0: Thanks for the issue report, v6 removed onChange and onBlur props, take a look at the changelog: https://github.com/react-hook-form/react-hook-form/blob/master/CHANGELOG.md
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