remove seoul zone

[lihsai0]

KODO-18166

[codecov]

Codecov Report

Merging #415 (be22e1a) into master (f83b1ac) will decrease coverage by 0.07%.
The diff coverage is n/a.

❗ Current head be22e1a differs from pull request most recent head 7445ba8. Consider uploading reports for the commit 7445ba8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
- Coverage   85.38%   85.31%   -0.07%     
==========================================
  Files          25       25              
  Lines        1889     1880       -9     
==========================================
- Hits         1613     1604       -9     
  Misses        276      276              

Impacted Files	Coverage Δ
src/Qiniu/Region.php	96.11% <ø> (-0.25%)	⬇️
src/Qiniu/Zone.php	100.00% <ø> (ø)