Update extensions.yml (#111)

This extension lets you create applications with event publishers and subscribers. Publishers communicate LOCALLY with subscribers by broadcasting events, Hangfire will process these events in the background via implemented handlers

_data/extensions.yml

@@ -169,6 +169,11 @@
       description: Show job logs on the dashboard.
       url: https://github.com/meriturva/Hangfire.Dashboard.JobLogs
       author: meriturva
+
+    - name: SubPub.Hangfire
+      description: Publishers create Hangfire Jobs for subscribers by broadcasting events
+      url: https://github.com/SitholeWB/SubPub.Hangfire
+      author: sitholewb
 
 - name: Storages
   description: The following community projects allow you to use your favorite technology