missing timer.cancel() in main

[maverickwoo]

Since 3ecd930, specifying a timeout actually causes vcprompt to run for exactly that many milliseconds. Tested on Python 2.7.1 in OS X. Patch based on 6a10066:

diff --git a/bin/vcprompt b/bin/vcprompt
index e8880f1..9e1dbb6 100755
--- a/bin/vcprompt
+++ b/bin/vcprompt
@@ -235,6 +235,7 @@ def main():
     output = vcprompt(options)
     if options.newline:
         output += '\n'
+    timer.cancel()
     return output

[djl]

Fixed in 164220d. Thanks!