Merge pull request #1105 from rughh/madridrb-update-sponsors

chore: Update Madrid.rb sponsors

Author: salzig

config/whitelabel.yml

@@ -387,12 +387,15 @@
   - :name: Sngular
     :url: https://www.sngular.com/
     :banner: sngular.png
-  - :name: Digital55
-    :url: https://digital55.com
-    :banner: digital55.png
-  - :name: Platform 161
-    :url: https://www.platform161.com/
-    :banner: platform161.png
+  - :name: Marketer
+    :url: https://realestate.marketer.tech/
+    :banner: marketer.png
+  - :name: Ruby Central
+    :url: https://rubycentral.org/
+    :banner: rubycentral.png
+  - :name: Fastly
+    :url: https://fastly.com
+    :banner: fastly.png
   - :name: JobFluent
     :url: https://www.jobfluent.com/es/empleos-madrid?q=ruby&utm_source=madridrb&utm_medium=sponsorship&utm_campaign=logo_nov2021
     :banner: jobfluent.png