Consider adding an ArduBadge badge to README.md

[gilmaimon]

Hi.

A nice addition to the readme page can be a badge from ArduBadge, It will look like this: Markdown: [![arduino-library-badge](https://www.ardu-badge.com/badge/Blynk.svg)](https://www.ardu-badge.com/Blynk)

The badge shows:

• That Blynk is available from the Arduino IDE (Library Manager)
• The newest available version (0.5.4 when writing this issue)
• Clicking on the badge redirects users to a custom page with explanation on installing Blynk (from the ide and from a ZIP file). It is great for new users.

Also, badges are awesome. Thank You! :)

[vshymanskyy]

Thanks, I think the existing badges are enough