Update README.md

Removing 5.6 support
Mastercard · Feb 13, 2023 · 0dc447e · 0dc447e
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 Library for Mastercard API compliant payload encryption/decryption.
 
 ### Compatibility <a name="compatibility"></a>
-PHP 5.6+
+PHP 7.0+
 
 ### References <a name="references"></a>
 <img src="https://user-images.githubusercontent.com/3964455/55345820-c520a280-54a8-11e9-8235-407199fa1d97.png" alt="Encryption of sensitive data" width="75%" height="75%"/>