Update README.md

Author: Felix Schäfer

README.md

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 # Arma RCon Class (ARC) 1.3 for PHP 
 
 ARC is a lightweight PHP class, which let's you easily send commands via  RCon to your Arma server. See "Supported Server" for a full list of supported Arma games.
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+ __*This version of ARC is deprecated, please use v2!*__
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 ## Supported Servers