update example : cf_X for filtering custom fields
update example : cf_X for filtering custom fields

arlin2050/php-redmine-api,leominov/php-redmine-api,abordin/php-redmine-api,ArchangelDesign/RedmineAdmin,kbsali/php-redmine-api,happy-code-com/php-redmine-api,airmoi/php-redmine-api,Kijubei/php-redmine-api,ferdynator/php-redmine-api,BertaOctech/php-redmine-api