Updated the Discord's welcome messages as of 2018-12-19 (#452)

src/constants.rs

@@ -35,7 +35,7 @@ pub static JOIN_MESSAGES: &'static [&'static str] = &[
     "A wild $user appeared.",
     "Swoooosh. $user just landed.",
     "Brace yourselves. $user just joined the server.",
-    "$user just joined. Hide your bananas.",
+    "$user just joined... or did they?",
     "$user just arrived. Seems OP - please nerf.",
     "$user just slid into the server.",
     "A $user has spawned in the server.",
@@ -47,7 +47,7 @@ pub static JOIN_MESSAGES: &'static [&'static str] = &[
     "It's a bird! It's a plane! Nevermind, it's just $user.",
     r"It's $user! Praise the sun! \[T]/",
     "Never gonna give $user up. Never gonna let $user down.",
-    "Ha! $user has joined! You activated my trap card!",
+    "$user has joined the battle bus.",
     "Cheers, love! $user's here!",
     "Hey! Listen! $user has joined!",
     "We've been expecting you $user",