update links in README

Author: Kristoffer Carlsson

README.md

@@ -52,9 +52,9 @@ This package exports following codecs and streams:
 
 See docstrings and [TranscodingStreams.jl](https://github.com/bicycle1885/TranscodingStreams.jl) for details.
 
-[travisci-img]: https://travis-ci.org/bicycle1885/CodecZlib.jl.svg?branch=master
-[travisci-url]: https://travis-ci.org/bicycle1885/CodecZlib.jl
+[travisci-img]: https://travis-ci.org/JuliaIO/CodecZlib.jl.svg?branch=master
+[travisci-url]: https://travis-ci.org/JuliaIO/CodecZlib.jl
 [appveyor-img]: https://ci.appveyor.com/api/projects/status/xy5bx1fdvuxgemph?svg=true
 [appveyor-url]: https://ci.appveyor.com/project/bicycle1885/codeczlib-jl
-[codecov-img]: http://codecov.io/github/bicycle1885/CodecZlib.jl/coverage.svg?branch=master
-[codecov-url]: http://codecov.io/github/bicycle1885/CodecZlib.jl?branch=master
+[codecov-img]: http://codecov.io/github/JuliaIO/CodecZlib.jl/coverage.svg?branch=master
+[codecov-url]: http://codecov.io/github/JuliaIO/CodecZlib.jl?branch=master