[notroj/neon] d54b0b: * src/ne_string.c (hex_chars): Use lowercase.

[Joe Orton]

  Branch: refs/heads/master
  Home:   https://github.com/notroj/neon
  Commit: d54b0b78a2d97c798e3171bfc7138c1928e6f5e3
      https://github.com/notroj/neon/commit/d54b0b78a2d97c798e3171bfc7138c1928e6f5e3
  Author: Joe Orton <joe at manyfish.uk>
  Date:   2020-12-06 (Sun, 06 Dec 2020)

  Changed paths:
    M src/ne_string.c
    M test/string-tests.c

  Log Message:
  -----------
  * src/ne_string.c (hex_chars): Use lowercase.
  (HEX2ASC): Avoid duplication, use hex_chars array.

* test/string-tests.c (qappend): Extend tests.