Fix Readme

Author: pitbulk

README.md

@@ -5,7 +5,7 @@
 Add SAML support to your Java applications using this library.
 Forget those complicated libraries and use that open source library provided and supported by OneLogin Inc.
 
-Version >= 2.5.0 compatible with java7 / java8 / java9.
+Version >= 2.5.0 compatible with java8 / java9. Not compatible with java7
 2.5.0 sets the 'strict' setting parameter to true.
 2.5.0 uses xmlsec 2.1.4 which fixes [CVE-2019-12400](https://snyk.io/vuln/SNYK-JAVA-ORGAPACHESANTUARIO-460281)