Update README.md

Author: mahdibland

Diff for: README.md

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 # Selenium Proxy Authentication For Firefox
 
 > Easily add your auth proxies to your Firefox (Gecko) Driver with one line of code With Extension
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-> <br />
-> ! You need to download the "Nightly" or "Developer Edition" of firefox because in the original browser extensions should be verified before installing since version 43
 
 ## Installation
 
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 ```markdown
 Install-Package SeleniumProxyAuthentication.Firefox -Version 1.0.0
 ```
+> ! You need to download the "Nightly" or "Developer Edition" of firefox to use this library because in the original browser extensions should be verified before installing since version 43
 
 ## How to Use it