add jeff9finger to java tech committee

Author: wing328

README.md

@@ -1109,7 +1109,7 @@ If you want to join the committee, please kindly apply by sending an email to wi
 | Groovy    |  |
 | Go        | @antihax (2017/11) @bvwells (2017/12) |
 | Haskell   | |
-| Java      | @bbdouglas (2017/07) @JFCote (2017/08) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) |
+| Java      | @bbdouglas (2017/07) @JFCote (2017/08) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) |
 | Kotlin     | @jimschubert (2017/09) |
 | Lua     | @daurnimator (2017/08) |
 | NodeJS/Javascript | @CodeNinjai (2017/07) @frol (2017/07) @cliffano (2017/07) |