Update README.md (#1930)

Adding "we're hiring" badge; updated "400 apps" --> "500 apps"

Author: dannyroosevelt

README.md

@@ -4,11 +4,12 @@
   <a href="https://pipedream.com/community"><img src="https://img.shields.io/badge/discourse-forum-brightgreen.svg?style=flat-square&link=https%3A%2F%2Fpipedream.com%2Fcommunity)](https://pipedream.com/community"></a>
   <a href="https://pipedream.com/support"><img src="https://img.shields.io/badge/-Join%20us%20on%20Slack-green?logo=slack&logoColor=34d28B&labelColor=150d11&color=34d28B&logoWidth=18&link=https%3A%2F%2Fpipedream.com%2Fsupport&link=https%3A%2F%2Fpipedream.com%2Fsupport)](https://pipedream.com/support"></a>
   <a href="https://twitter.com/intent/follow?original_referer=https%3A%2F%2Fpublish.twitter.com%2F%3FbuttonType%3DFollowButton%26query%3Dhttps%253A%252F%252Ftwitter.com%252Fpipedream%26widget%3DButton&ref_src=twsrc%5Etfw&region=follow_link&screen_name=pipedream&tw_p=followbutton"><img src="https://img.shields.io/twitter/follow/pipedream?label=Follow%20%40pipedream&style=social"></a>
+  <a href="https://angel.co/company/pipedreamhq/jobs/"><img src="https://img.shields.io/badge/%F0%9F%91%8B%F0%9F%8F%BC%20We're%20hiring!-Join%20us-brightgreen"></a>
 </p>
 
 Pipedream is an integration platform for developers.
 
-We provide a free, hosted platform that makes it easy to connect apps and develop, execute and maintain event-driven workflows. The platform has over 400 fully integrated applications with managed authentication and support for over 1M npm packages.
+We provide a free, hosted platform that makes it easy to connect apps and develop, execute and maintain event-driven workflows. The platform has over 500 fully integrated applications with managed authentication and support for over 1M npm packages.
 
 **Key Features**:
 
@@ -45,7 +46,7 @@ As you build more advanced workflows, you may also find these docs helpful:
 
 ## Event Sources
 
-Pipedream receives data via event sources. Event sources are open source, run on Pipedream's infrastructure and collect data from your own application and/or services like GitHub, DropBox, Zoom, RSS feeds, and more.
+Pipedream receives data via event sources. Event sources are open source, run on Pipedream's infrastructure and collect data from your own application and/or services like GitHub, Dropbox, Zoom, RSS feeds, and more.
 
 Event sources emit new events produced by the service, which can trigger Pipedream workflows, or which you can consume using [Pipedream's REST API](https://docs.pipedream.com/api/rest/) or a private, real-time [SSE stream](https://docs.pipedream.com/api/sse/).