Merge pull request #8 from kmulvey/correct-jwe-link

correct JWE link
diff --git a/README.md b/README.md
index 50e0cd3..ba85b0a 100644
--- a/README.md
+++ b/README.md
@@ -31,5 +31,5 @@
 [docs]:    https://godoc.org/github.com/SermoDigital/jose
 [license]: https://github.com/SermoDigital/jose/blob/master/LICENSE.md
 [jws]: https://tools.ietf.org/html/rfc7515
-[jwe]: https://tools.ietf.org/html/rfc7515
+[jwe]: https://tools.ietf.org/html/rfc7516
 [jwt]: https://tools.ietf.org/html/rfc7519