Update README.md

Author: infamousjoeg

README.md

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 Conceal is a command-line utility that eases the interaction between developer and OSX Keychain Access and Linux Keyring. It is the open-source companion to [Summon](https://cyberark.github.io/summon) as every secret added using this tool into Keychain/Keyring is added using Summon-compliant formatting.
 
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 ## Table of Contents <!-- omit in toc -->
 - [Requirements](#requirements)
 - [Installation](#installation)