fixed URL on github.io

github.io moved to https and http returns 301 redirect

plugins/gitignore/gitignore.plugin.zsh

-function gi() { curl http://www.gitignore.io/api/$@ ;}
+function gi() { curl https://www.gitignore.io/api/$@ ;}
 
 _gitignireio_get_command_list() {
-  curl -s http://www.gitignore.io/api/list | tr "," "\n"
+  curl -s https://www.gitignore.io/api/list | tr "," "\n"
 }
 
 _gitignireio () {