fix broken link for placeholdit

[lilisako]

Issue#

#2328

Description:

• Placeholdit image url is no longer available in https. It seems that placeholder.it changed their domain. For example, https://placehold.it/300x300.png redirects to http://placehold.it/300x300.png automatically.

Just specify the image size after our URL (https://via.placeholder.com/) and you’ll get a placeholder image.

C/O https://placeholder.com/

Before

> Faker::Placeholdit.image
https://placehold.it/300x300.png
> Faker::Placeholdit.image(size: '50x50')
https://placehold.it/50x50.png

After

> Faker::Placeholdit.image
https://via.placeholder.com/300x300.png
> Faker::Placeholdit.image(size: '50x50')
https://via.placeholder.com/50x50.png

[koic]

This looks good to me. Can you squash your commits into one?

[lilisako]

@koic Thanks for the prompt response! I squashed the commits as you said.
Thanks in advance,
Risako

[koic]

Thanks!