Update README

README

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-Boost Endian library
-
-The Endian library is included in Boost release 1.58.0 and later.
-
-See http://boostorg.github.io/endian to browse the documentation without having to
-download the library or install Boost.
-
-To experiment with the Endian library, various other boost libraries must be
-available. So you need to install Boost or clone a current version of boostorg/boost
-if you have not already done so.
-
-Boost.Endian is a header-only library, so there is no need to run a build
-for it, although you may need to do a "b2 headers".
-
-If your clone of boost is already in place, please remember to:
-
-  cd boost
-  git pull
-  git submodule update --init
-  git submodule update
-  ./b2 headers
-  
-On Windows, "./" is unnecessary.  
-
----------------------------
-Copyright Beman Dawes, 2013
-
-Distributed under the Boost Software License, Version 1.0.
-http://www.boost.org/LICENSE_1_0.txt 

README.md

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+# Boost.Endian
+
+The Endian library provides facilities for dealing with
+[endianness](https://en.wikipedia.org/wiki/Endianness).
+It's part of Boost since release 1.58.0. See
+[the documentation](http://boost.org/libs/endian) for more information.
+
+## Supported compilers
+
+* g++ 4.4 or later
+* clang++ 3.3 or later
+* Visual Studio 2008 or later
+
+Tested on [Travis](https://travis-ci.org/boostorg/endian/) and
+[Appveyor](https://ci.appveyor.com/project/pdimov/endian/).
+
+## License
+
+Distributed under the
+[Boost Software License, Version 1.0](http://boost.org/LICENSE_1_0.txt).