Add a codecov badge (#30)

This adds a codecov badge to the README file. Pull Request Link: #30 Pull Request Branch: donaldong/add_a_codecov_badge
chanzuckerberg · Jul 8, 2020 · e58e20f · e58e20f
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diff --git a/README.md b/README.md
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 Redcord
 -------------------------------
 [![Gem Version](https://badge.fury.io/rb/redcord.svg)](https://badge.fury.io/rb/redcord)
+[![codecov](https://codecov.io/gh/chanzuckerberg/redcord/branch/master/graph/badge.svg)](https://codecov.io/gh/chanzuckerberg/redcord)
 
 A Ruby ORM like Active Record, but for Redis.