fix missing namespace (oops)
fix missing namespace (oops)

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