Update README.md

correct spelling of "exert"

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 The interactive PHP debugger
 ============================
 
-Implemented as a SAPI module, phpdbg can excert complete control over the environment without impacting the functionality or performance of your code.
+Implemented as a SAPI module, phpdbg can exert complete control over the environment without impacting the functionality or performance of your code.
 
 phpdbg aims to be a lightweight, powerful, easy to use debugging platform for PHP 5.4+