Remove invalid option for curl_setopt_array (#25)

* remove invalid option

* bumb version

Merge pull request #21 from xaviered/xaviered/bug_fix_append_command

Auto-adding content-length heading to fix append-command bug

Merge pull request #19 from xaviered/xaviered/optimize_memory_usage

Use the least amount of memory as possible.

remove not used

Merge pull request #15 from xaviered/feature/patch-1

New patch