chore: add contributor badge (#746)

* chore: add badge
Signed-off-by: feng-tao <fengtao04@gmail.com>

* doc: update a bit
Signed-off-by: feng-tao <fengtao04@gmail.com>

README.md

@@ -16,6 +16,9 @@
   <a href="https://github.com/amundsen-io/amundsen/pulse">
     <img src="https://img.shields.io/github/commit-activity/w/amundsen-io/amundsen.svg" />
   </a>
+  <a href="https://img.shields.io/github/contributors/amundsen-io/amundsen.svg">
+    <img src="https://img.shields.io/github/contributors/amundsen-io/amundsen.svg" />
+  </a>
   <a href="https://twitter.com/amundsenio">
     <img src="https://img.shields.io/twitter/follow/amundsenio?label=Follow&style=social" />
   </a>
@@ -155,6 +158,7 @@ Please visit [Roadmap](https://github.com/amundsen-io/amundsen/blob/master/docs/
 - [Facilitating Data discovery with Apache Atlas and Amundsen](https://medium.com/wbaa/facilitating-data-discovery-with-apache-atlas-and-amundsen-631baa287c8b) by [Mariusz Górski](https://github.com/mgorsk1) from [ING](https://www.ing.com/Home.htm) (June 2020)
 - [Using Amundsen to Support User Privacy via Metadata Collection at Square](https://developer.squareup.com/blog/using-amundsen-to-support-user-privacy-via-metadata-collection-at-square/) by [Alyssa Ransbury](https://github.com/alran) from [Square](https://squareup.com/) (July 14, 2020)
 - [Amundsen Joins LF AI as New Incubation Project](https://lfai.foundation/blog/2020/08/11/amundsen-joins-lf-ai-as-new-incubation-project/) (Aug 11, 2020)
+- [Amundsen: one year later](https://eng.lyft.com/amundsen-1-year-later-7b60bf28602) (Oct 6, 2020)
 
 ## Talks