Update README by removing stable MELPA badge

Removed stable MELPA badge from README.

Author: beacoder

README.org

@@ -3,7 +3,6 @@
 [[MIT licensed][file:https://img.shields.io/badge/license-MIT-blue.svg]]
 [[https://github.com/beacoder/stock-tracker/actions][file:https://github.com/beacoder/stock-tracker/workflows/CI/badge.svg]]
 [[http://melpa.org/#/stock-tracker][file:http://melpa.org/packages/stock-tracker-badge.svg]]
-[[https://stable.melpa.org/#/stock-tracker][file:https://stable.melpa.org/packages/stock-tracker-badge.svg]]
 [[996.icu][file:https://img.shields.io/badge/link-996.icu-red.svg]]
 
 =stock-tracker= is a simple interface for Emacs to track stocks in china and us markets.