Update highfive.json

Changed some bits to be gender neutral

Author: IlGnome

data/attacks/highfive.json

@@ -5,13 +5,13 @@
         "{nick} gives {user} an elbow-shattering high-five",
         "{nick} smashes {user} up high",
         "{nick} slaps skin with {user}",
-        "{nick} {user} winds up for a killer five but misses and falls flat on his face",
+        "{nick} {user} winds up for a killer five but misses and falls flat on their face",
         "{nick} halfheartedly high-fives {user}",
         "{nick} gives {user} a smooth five down low",
         "{nick} gives {user} a friendly high five",
         "{nick} starts to give {user} a high five, but leaves them hanging",
         "{nick} performs an incomprehensible handshake with {user} that identifies them as the very best of friends",
-        "{nick} makes as if to high five {user} but pulls his hand away at the last second",
+        "{nick} makes as if to high five {user} but pulls their hand away at the last second",
         "{nick} leaves {user} hanging",
         "{nick} offers a fist and {user} pounds it"
     ],