CONTRIBUTING: does this fix it? [skip ci]

Author: guyharris

CONTRIBUTING.md

@@ -88,7 +88,7 @@ and ask!
    tests are being run, is used when "local time" values are printed.  The
    actual test compares the current text output with the expected result
    (`sample.out`) saved from a previous version.
-
+   
    Any new/updated fields in a dissector must be present in a `sample.pcap` file
    and the corresponding output file.