Prefer long unicode class names over the short ones

[fisker Cheung]

Motivation

The long hand names are more readable.

Description

Same as above.

Examples

/* ✓ GOOD */
/\p{Letter}/v

/* ✗ BAD */
/\p{L}/v

/* ✓ GOOD */
 /\p{Script=Greek}/v

/* ✗ BAD */
/\p{sc=Greek}/v

[Yosuke Ota]

Thank you for the rule suggestion! That rule sounds good to me!