Update R technical committee (#3284)

Author: wing328

README.md

@@ -787,7 +787,7 @@ If you want to join the committee, please kindly apply by sending an email to te
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-| R         |  |
+| R         | @Ramanth (2019/07) @saigiridhar21 (2019/07) |
 | Ruby      | @cliffano (2017/07) @zlx (2017/09) @autopp (2019/02) |
 | Rust      | @frol (2017/07) @farcaller (2017/08) @bjgill (2017/12) |
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