Update AUTHORS, change to MarkDown.

AUTHORS.md

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+## Authors
+
+ * ZeroTier protocol design and core network virtualization engine, ZeroTier One service, React web UI, packaging for most platforms, kitchen sink...<br>
+   Adam Ierymenko / [email protected]
+
+ * Java JNI Interface to enable Android application development, and Android app itself (code for that is elsewhere)<br>
+   Grant Limberg / [email protected]
+
+## Contributors
+
+ * Debugging and testing, OpenWRT support fixes.<br>
+   Moritz Warning / [email protected]
+
+ * Several others made smaller contributions, which GitHub tracks here:<br>
+   https://github.com/zerotier/ZeroTierOne/graphs/contributors
+
+## Third Party Code
+
+ * LZ4 compression algorithm by Yann Collet (BSD license)<br>
+   http://code.google.com/p/lz4/
+
+ * http-parser by many authors (MIT license)<br>
+   https://github.com/joyent/http-parser
+
+ * json-parser by James McLaughlin (BSD license)<br>
+   https://github.com/udp/json-parser
+
+ * TunTapOSX by Mattias Nissler (BSD license)<br>
+   http://tuntaposx.sourceforge.net
+
+ * tap-windows and tap-windows6 by the OpenVPN project (GPL)<br>
+   https://github.com/OpenVPN/tap-windows<br>
+   https://github.com/OpenVPN/tap-windows6
+
+ * Salsa20 stream cipher, Curve25519 elliptic curve cipher, Ed25519
+   digital signature algorithm, and Poly1305 MAC algorithm, all by
+   Daniel J. Bernstein (public domain)<br>
+   http://cr.yp.to/

AUTHORS.txt

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-ZeroTier One is designed and written by Adam Ierymenko, with a few bug
-fixes and other contributions from other users. Information about all
-contributors can be found on the GitHub home page at:
-
-https://github.com/zerotier/ZeroTierOne
-
-ZeroTier One includes the following third party code:
-
- * LZ4 compression algorithm by Yann Collet (BSD license)
-   http://code.google.com/p/lz4/
-
- * http-parser by many authors (MIT license)
-   https://github.com/joyent/http-parser
-
- * json-parser by James McLaughlin (BSD license)
-   https://github.com/udp/json-parser
-
- * TunTapOSX by Mattias Nissler (forked for ZT1) (BSD license)
-   http://tuntaposx.sourceforge.net
-
- * tap-windows by the OpenVPN project (forked for ZT1) (GPL)
-   https://github.com/OpenVPN/tap-windows
-
- * Salsa20 stream cipher, Curve25519 elliptic curve cipher, Ed25519
-   digital signature algorithm, and Poly1305 MAC algorithm, all by
-   Daniel J. Bernstein (public domain)
-   http://cr.yp.to/