memory usage improve
gc collect after re_generate
add todo
4 process to build
update logger message
fixbug: group should be list to send args
per page 9 posts
move src_ext len to global to cache it
update readme
ready for v0.4.0 releasion
Merge branch 'dev'

* dev:
  ready for v0.4.0 releasion
  update readme
  move src_ext len to global to cache it
  per page 9 posts
  fixbug: group should be list to send args
  update logger message
  4 process to build
  add todo
  gc collect after re_generate
  memory usage improve