Update gitignore
Update gitignore

chef-cookbooks/yum,juliandunn/yum,someara/yum,GannettDigital/chef-yum,chef-cookbooks/yum,someara/yum,h4ck3rm1k3/yum,GannettDigital/chef-yum,h4ck3rm1k3/yum,GannettDigital/chef-yum,h4ck3rm1k3/yum,hippolin/yum-cookbook,hippolin/yum-cookbook,mrb/yum,mattray/yum,hippolin/yum-cookbook,autotraderuk/yum,autotraderuk/yum,autotraderuk/yum,mattray/yum,mattray/yum,mrb/yum,mrb/yum,someara/yum,juliandunn/yum