Further center align logo (#407)

* Further center align logo

* fix

* fix

README.md

-<img
-  src="https://raw.githubusercontent.com/lyft/amundsen/master/docs/img/logos/amundsen_logo_on_light.svg?sanitize=true"
-  alt="Amundsen"
-  width="1000"
-/>
-
-[![License](https://img.shields.io/:license-Apache%202-blue.svg)](LICENSE)
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+<p align="center">
+  <img
+    src="https://raw.githubusercontent.com/lyft/amundsen/master/docs/img/logos/amundsen_logo_on_light.svg?sanitize=true"
+    alt="Amundsen"
+    width="1000"
+  />
+</p>
+
+<p align="center">
+  <img src="https://img.shields.io/:license-Apache%202-blue.svg" />
+  <img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg" />
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+    <img src="https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social" alt="Slack" />
+  </a>
+</p>
 
 Amundsen is a metadata driven application for improving the productivity of data analysts, data scientists and engineers when interacting with data. It does that today by indexing data resources (tables, dashboards, streams, etc.) and powering a page-rank style search based on usage patterns (e.g. highly queried tables show up earlier than less queried tables). Think of it as Google search for data. The project is named after Norwegian explorer [Roald Amundsen](https://en.wikipedia.org/wiki/Roald_Amundsen), the first person to discover the South Pole.