If you can insert the ESC character, u001B, it's easy. (Though note that it appears as the two characters ^[ in the blog post, so your code should start ESC[5m with only one bracket.)
Unfortunately Sublime wasn't happy with me trying to type it through the Mac Unicode Hex input, but I was able to copy-paste it in, and I was also able to enter it directly in other programs, like GitHub desktop.
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If you can insert the ESC character, u001B, it's easy. (Though note that it appears as the two characters ^[ in the blog post, so your code should start ESC[5m with only one bracket.)
Unfortunately Sublime wasn't happy with me trying to type it through the Mac Unicode Hex input, but I was able to copy-paste it in, and I was also able to enter it directly in other programs, like GitHub desktop.