Update README.md

Author: chrisdalke

README.md

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 ![commit-activity-badge](https://img.shields.io/github/last-commit/telemetryjet/telemetryjet-arduino-sdk)
 ![license-badge](https://img.shields.io/github/license/telemetryjet/telemetryjet-arduino-sdk)
 
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 The TelemetryJet Arduino SDK is a lightweight, flexible library for communicating with microcontrollers. The Arduino SDK is a wrapper around [MessagePack](https://msgpack.org/index.html) that allows you to send and receive data points using a high-level API.
 
 ### Features