Update readme

README.md

@@ -7,7 +7,7 @@
 [![Javadocs](https://www.javadoc.io/badge/at.favre.lib/hkdf.svg)](https://www.javadoc.io/doc/at.favre.lib/hkdf)
 [![Coverage Status](https://coveralls.io/repos/github/patrickfav/hkdf/badge.svg?branch=master)](https://coveralls.io/github/patrickfav/hkdf?branch=master)
 
-This is supposed to be a standalone, lightweight, simple to use, fully tested and stable implementation in Java. The code is compiled with [Java 7](https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7) to be compatible with most [_Android_](https://www.android.com/) versions as well as normal Java applications. It passes all test vectors from [RFC 5869 Appendix A.](https://tools.ietf.org/html/rfc5869#appendix-A).
+This is supposed to be a standalone, lightweight, simple to use, fully tested and stable implementation in Java. The code is compiled with [Java 7](https://en.wikipedia.org/wiki/Java_version_history#Java_SE_7) to be compatible with most [_Android_](https://www.android.com/) versions as well as normal Java applications. It passes all test vectors from [RFC 5869 Appendix A.](https://tools.ietf.org/html/rfc5869#appendix-A)
 
 ## Quickstart