add backtick html code

[TheDen]

We've had issues using terminal-to-html with buildkite annotations when there are backticks, which seems to conflict with CommonMark. Using the HTML encoding ` ensures that backticks won't be parsed as MarkDown.

[TheDen]

I initially tried updating this file , i.e., something like

                b.buf.WriteString(""")
        case '/':
                b.buf.WriteString("/")
+       case '`':
+               b.buf.WriteString("`")
        default:
                b.buf.WriteRune(char)
        }

but that didn't work as expected with replacement when running the binary, and it also fails a test

go test
--- FAIL: TestRendererAgainstFixtures (0.05s)
    terminal_test.go:266: homer.sh did not match, got len 1108 and expected len 1100
FAIL
exit status 1
FAIL    github.com/TheDen/terminal      0.063s
make: *** [test] Error 1```

[ticky]

Hey @TheDen, I don’t think you should be running into those issues with it as it stands - can you shoot support@buildkite.com a link to a build where this is going wrong for you?

[TheDen]

Hey @ticky no problem, I sent an email (subject has this PR url). Thanks 👍