update contributors

Author: Cam Pedersen

package.json

@@ -2,7 +2,11 @@
   "author": "Cam Pedersen <diffference@gmail.com> (http://campedersen.com/)",
   "contributors": [
     "Gabriel Preston <gpreston@gmail.com> (http://www.morethanawesome.com/)",
-    "Alex Weidmann"
+    "Alex Weidmann <alex@twinsoftech.com>",
+    "Ben Evans <ben@bensbit.co.uk>",
+    "Gabriel Preston <gpreston@gmail.com>",
+    "Joseph Silvestre <joseph.silvestre38@gmail.com>",
+    "appr <appr@appr.me>"
   ],
   "name": "scp",
   "description": "remote file copy wrapper",