Add Ȟ ȟ characters, U+201E & U+201F (was: Request for a new letter with diacritics)

[VladimirMarkelov]

Could you add the letter H with a caron?:

• Ȟ (U+021E LATIN CAPITAL LETTER H WITH CARON)
• ȟ (U+021F LATIN SMALL LETTER H WITH CARON)

Thank you!

[pauldhunt]

Will add in next version.