updated changelog

Author: JoshuaEstes

CHANGELOG.md

@@ -3,6 +3,10 @@ Change log
 
 ## [unreleased]
 
+### Fixed
+
+- [#16] incompatible with psr/http-message current version
+
 ## [2.0.1] - 2015-03-27
 
 ### Added
@@ -37,3 +41,4 @@ Initial release of 2.x
 [unreleased]: https://github.com/nbobtc/bitcoind-php/compare/2.0.1...2.x
 [2.0.1]: https://github.com/nbobtc/bitcoind-php/compare/2.0.0...2.0.1
 [2.0.0]: https://github.com/nbobtc/bitcoind-php/compare/2d30e2f9ee617f44336581386cd0734613c7353d...2.0.0
+[#16]: https://github.com/nbobtc/bitcoind-php/issues/16