bug in calculate pace swim

[jmkoni]

TestPace#test_calculates_pace_swim [test/pace_test.rb:23]:
--- expected
+++ actual
@@ -1 +1 @@
-"To swim 500 meters in 0:10:00, you need a pace of 0:54/50yd."
+"To swim 500.0 50yd in 0:10:00, you need a pace of 0:54/50yd."