Remove duplicate readme badge

Author: jonas-schievink

README.md

@@ -1,5 +1,4 @@
 [![crates.io](https://img.shields.io/crates/d/nrf-usbd.svg)](https://crates.io/crates/nrf-usbd)
-[![crates.io](https://img.shields.io/crates/v/nrf-usbd.svg)](https://crates.io/crates/nrf-usbd)
 ![Build Status](https://github.com/nrf-rs/nrf-usbd/workflows/CI/badge.svg)
 
 # `nrf-usbd`
@@ -25,4 +24,4 @@ This trait declares all the peripheral properties that may vary from one device
 See the [`nrf-hal`](https://github.com/nrf-rs/nrf-hal) for the reference HAL implementation.
 
 See the [`example`](./example) directory for an example on how to use it standalone without a HAL. This is
-discouraged, the recommended usage is through `nrf-hal`.
+discouraged, the recommended usage is through `nrf-hal`.