middleman article generates incorrect yaml when the title contains characters that should be escaped

[rinpatch]

Expected behaviour

Running middleman article "Title with: a colon" with default new article template would generate a correct source file.

Actual behaviour

YAML Exception parsing /home/rin/sw/pleroma.social/source/blog/2020-03-16-title-with-a-colon.html.markdown: (<unknown>): mapping values are not allowed in this context at line 2 column 18

Steps to reproduce the problem

Run middleman article "Title with: a colon" in a project with no custom new article template defined.

Additional information

• Ruby version: ruby 2.5.6p201 (2019-08-28 revision 67796) [x86_64-linux]
• Middleman version: 4.3.5
• Middleman Blog version: 4.0.3
• OS version: Linux 4.19.27-gentoo-r1 x86_64

[markets]

ℹ️ This issue is stale because it has been open for more than 90 days with no activity. It will be closed in 30 days if no further activity occurs. Thank you for your contributions.