YAML syntax highlighting with multiline string and single quote

[alexr00]

• VSCode Version: 1.35.0
• OS Version: Windows 10, version 1903

Steps to Reproduce:

1. Write in an *.yml file:

some_bash_script:
  content: |
            echo 'Some multi-line echo...

            ...ending with two line breaks. 

            ' > some_file.txt
  some:
  further:
  yaml:
  parts:

Effect:

You can, however, work this around with not-so-pretty-trick...

[alexr00]

Might be a duplicate of #17