Bors badge into README

To show we are using bors utilities add bors badge linking to the
repository

Signed-off-by: Rafael Garcia Ruiz <rafael.garcia@collabora.com>

Author: Razaloc

README.md

@@ -15,6 +15,8 @@ Right now, the implemented function is copying system images files using bmap, w
 safer and faster than regular `cp` or `dd`. It  can be used to flash system images into block
 devices, but it can also be used for general image flashing purposes.
 
+[![Bors enabled](https://bors.tech/images/badge_small.svg)](https://app.bors.tech/repositories/48555)
+
 ## Installation
 ```
 cargo install bmap-rs