Update README.md

Author: pitbulk

README.md

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 # OneLogin's SAML Java SAML
 
+Note: There is a new [2.0.0](https://github.com/onelogin/java-saml/tree/v2.0.0) with a lot of security improvements and new supported features. Soon it will be available at Maven Central Repository. (This new version is not compatible with 1.1.2)
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 Updating from 1.0-SNAPSHOT to 1.1.2
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