Update contributors

Author: abitmore

CONTRIBUTORS.txt

@@ -29,6 +29,7 @@ Valentine Zavgorodnev <[email protected]>
 Michael Vandeberg <[email protected]>
 James Calfee <[email protected]>
 Alexey Frolov <[email protected]>
+syalon <[email protected]>
 takaaki7 <[email protected]>
 Nicolas Wack <[email protected]>
 Taconator <[email protected]>
@@ -40,8 +41,10 @@ Zapata <[email protected]>
 btcinshares <[email protected]>
 crazybits <[email protected]>
 Anzhy Cherrnyavski <[email protected]>
+Tengfei Niu <[email protected]>
 Tiago Peralta <[email protected]>
 ioBanker <[email protected]>
+Karl Semich <[email protected]>
 Michael Vandeberg <[email protected]>
 SahkanDesertHawk <[email protected]>
 Scott Howard <[email protected]>
@@ -62,7 +65,6 @@ Haruka Ma <[email protected]>
 Jaewoo Cho <[email protected]>
 Jose Marcial Vieira Bisneto <[email protected]>
 Jozef Knaperek <[email protected]>
-Karl Semich <[email protected]>
 Ken Code <[email protected]>
 Krzysztof Szumny <[email protected]>
 Paul Brossier <[email protected]>