Stopwatch: add chronometer (fixes #3843)

lib/DDG/Goodie/Stopwatch.pm

@@ -7,7 +7,7 @@ use strict;
 zci answer_type => 'stopwatch';
 zci is_cached => 1;
 
-triggers startend => 'stopwatch', 'stop watch';
+triggers startend => 'stopwatch', 'stop watch', 'chronometer', 'chronograph';
 
 # Handle statement
 handle remainder => sub {

t/Stopwatch.t

@@ -31,6 +31,7 @@ ddg_goodie_test(
     'stopwatch' => build_test(),
     'online stop watch' => build_test(),
     'stopwatch online' => build_test(),
+    'chronometer' => build_test(),
     'blahblah stopwatch' => undef
 );