Changes of version 15.6.2

• Fix assignment of l for SS08.
• Fix PHP ligation set's .= (#1390).

Changes of version 15.6.1

• Add characters:

• BLANK SYMBOL (U+2422);
• SYMBOL FOR DELETE FORM TWO (U+2425);
• SYMBOL FOR SUBSTITUTE FORM TWO (U+2426);

Changes of version 15.6.0

• Fix assignment of r and w for SS09 (#1378, #1379).
• Add variant selectors for Cyrillic Zhe (#1380).
• Harmonize dimensions of Cyrillic Yer, Yeri and Yery (#1382).