README: move shields above header

Signed-off-by: Alexander Martinz <[email protected]>

Author: amartinz

README.md

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-# promise-android-tools ![Continuous Integration](https://github.com/ubports/promise-android-tools/workflows/Continuous%20Integration/badge.svg) [![npm](https://img.shields.io/npm/v/promise-android-tools)](https://www.npmjs.com/package/promise-android-tools) [![codecov](https://codecov.io/gh/ubports/promise-android-tools/branch/master/graph/badge.svg?token=cEneFUUbgt)](https://codecov.io/gh/ubports/promise-android-tools/)
+![Continuous Integration](https://github.com/ubports/promise-android-tools/workflows/Continuous%20Integration/badge.svg) [![npm](https://img.shields.io/npm/v/promise-android-tools)](https://www.npmjs.com/package/promise-android-tools) [![codecov](https://codecov.io/gh/ubports/promise-android-tools/branch/master/graph/badge.svg?token=cEneFUUbgt)](https://codecov.io/gh/ubports/promise-android-tools/)
+
+# promise-android-tools
 
 A wrapper for Adb, Fastboot, and Heimall written in modern asynchronous TypeScript that provides convenient promises for interacting with Android and Ubuntu Touch devices. The package was originally developed for the [UBports Installer](https://devices.ubuntu-touch.io/installer/) but has since been expanded to cover all APIs of the included tools.