Update README badges.

Author: Gadgetoid

README.md

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 # Python ST7789
 
-[![Build Status](https://travis-ci.com/pimoroni/st7789-python.svg?branch=master)](https://travis-ci.com/pimoroni/st7789-python)
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 Python library to control an ST7789 TFT LCD display
 
 Designed specifically to work with a ST7789 based 240x240 pixel TFT SPI display. (Specifically the [1.3" SPI LCD from Pimoroni](https://shop.pimoroni.com/products/1-3-spi-colour-lcd-240x240-breakout)).