Update README.md

Changed badges from HTML code to markdown for consistency

Signed-off-by: Mpho Mphego <mpho112@gmail.com>

README.md

@@ -17,9 +17,9 @@ The Pi-hole[®](https://pi-hole.net/trademark-rules-and-brand-guidelines/) is a
 - **Free**: open source software which helps ensure _you_ are the sole person in control of your privacy
 
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-<a href="https://www.codacy.com/app/Pi-hole/pi-hole?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=pi-hole/pi-hole&amp;utm_campaign=Badge_Grade"><img src="https://api.codacy.com/project/badge/Grade/c558a0f8d7124c99b02b84f0f5564238" alt="Codacy Grade"/></a>
-<a href="https://travis-ci.org/pi-hole/pi-hole"><img src="https://travis-ci.org/pi-hole/pi-hole.svg?branch=development" alt="Travis Build Status"/></a>
-<a href="https://www.bountysource.com/trackers/3011939-pi-hole-pi-hole?utm_source=3011939&utm_medium=shield&utm_campaign=TRACKER_BADGE"><img src="https://www.bountysource.com/badge/tracker?tracker_id=3011939" alt="BountySource"/></a>
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/c558a0f8d7124c99b02b84f0f5564238)](https://www.codacy.com/app/Pi-hole/pi-hole?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=pi-hole/pi-hole&amp;utm_campaign=Badge_Grade)
+[![Build Status](https://travis-ci.org/pi-hole/pi-hole.svg?branch=development)](https://travis-ci.org/pi-hole/pi-hole)
+[![BountySource](https://www.bountysource.com/badge/tracker?tracker_id=3011939)](https://www.bountysource.com/trackers/3011939-pi-hole-pi-hole?utm_source=3011939&utm_medium=shield&utm_campaign=TRACKER_BADGE")
 
 ## One-Step Automated Install
 Those who want to get started quickly and conveniently may install Pi-hole using the following command: