[bug] java 15 text blocks breaks syntax highlighting

[ghost]

from what i understand, github uses code from this repo to do syntax highlighting.

if i write this:

  var json = """
        {
          "version": "https://jsonfeed.org/version/1.1"
        }
        """;
    var jsonFeedFromJsonString = JsonFeed.fromJson(json);

i would expect var jsonFeedFromJsonString = JsonFeed.fromJson(json); not to be highlighted like a string.
text blocks are a new feature of java since jdk 15, see https://openjdk.java.net/jeps/378