(Ruby) Heredoc without interpolation ending isn't highlighted correctly

[JamesPaden]

Describe the issue
Ruby heredocs without interpolation have slightly different openings and closings and are not being highlighted correctly.

Which language seems to have the issue?
Ruby

Are you using highlight or highlightAuto?
highlight

Sample Code to Reproduce

# standard heredoc
message = <<-MESSAGE
  This looks good
MESSAGE

# heredoc without interpolation
message = <<-'MESSAGE'
  This isn't highlighted correctly
MESSAGE

def not_a_string_anymore()
end

Screenshot

Expected behavior
The entire heredoc should be highlighted as a string, with the ending detected.

Additional context
Ruby documentation:
https://ruby-doc.org/core-2.5.0/doc/syntax/literals_rdoc.html#label-Here+Documents

[joshgoebel]

@JamesPaden Does that look about right?

[JamesPaden]

@joshgoebel Looks great. Thanks for the quick fix!!!