clarify limitation of features, per issue #4

Author: arrowtype

config.yaml

@@ -102,10 +102,8 @@ Features:
 - ss01 # Single-story a
 - ss02 # Single-story g
 - ss03 # Simplified f
-- ss04 # Simplified i
 - ss05 # Simplified l
 - ss06 # Simplified r
-- ss07 # Simplified italic diagonals (kwxyz)
 - ss08 # Serifless L and Z
 - ss09 # Simplified 6 and 9
 - ss10 # Dotted 0