How do I fix my failed PRs?

[mark]

On Sunday, 2 February 2020 at 12:49:31 UTC, MoonlightSentinel 
wrote:
> On Sunday, 2 February 2020 at 08:54:02 UTC, mark wrote:
>> However, four have not been accepted, apparently for technical 
>> reasons. But I don't understand what's wrong or what I need to 
>> do to fix them. (I'm not very knowledgeable about github.)
>
> The Travis log suggest that your PRs contain some whitespace 
> errors:
>
>> The command "grep -nr --include \*.md '\s$' . ; test $? -eq 1" 
>> exited with 1
>
> You could try to execute the ggrep command locally to identify 
> lines containing possible errors.
>
> PS: Feel free to comment on your PR directly s.t. 
> reviewers/bypassers can see that you could use some assistance.

I edit online on github itself so can't check for this kind of 
thing.
Anyway, I've added a comment to each PR so hopefully that will 
help.