Add 2x new bronze sponsors

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

BACKERS.md

@@ -24,18 +24,13 @@ Be the first.
 
 <a href="https://asyncy.com"><img alt="ASYNCY" src="https://www.openfaas.com/images/sponsors/asyncy.png" width="100px" /></a>
 
-
 <a href="https://www.serverlessnomad.com"><img alt="Serverless Nomad" src="https://www.openfaas.com/images/sponsors/serverlessnomad.png" width="60px" /></a>
 
 *Serverless Nomad*
 
-<!---
-Pending start in April 2019 with first sponsorship payment:
-
-* [Garden.io](https://garden.io)
-* [Contiamo](https://www.contiamo.com)
+<a href="https://garden.io"><img alt="Garden.io" src="https://www.openfaas.com/images/sponsors/garden.png" width="100px" /></a>
 
--->
+<a href="https://www.contiamo.com"><img alt="Contiamo" src="https://docs.openfaas.com/images/logos/contiamo.svg" width="100px" /></a>
 
 ## Backers