[COOK-1087] Update the CONTRIBUTING file to fix a minor typo
[COOK-1087] Update the CONTRIBUTING file to fix a minor typo

josephholsten/opscode-cookbooks-bluepill,chef-cookbooks/bluepill,cookbooks/oc-bluepill,gswallow/bluepill,7bfa689ac3c4be50f8ba6c1ea8c5f316/bluepill,3months/bluepill,opscode-cookbooks/bluepill,miketheman/opscode-bluepill,RallySoftware-cookbooks/bluepill,gswallow/bluepill,chef-cookbooks/bluepill,opscode-cookbooks/bluepill,alexclear/bluepill,7bfa689ac3c4be50f8ba6c1ea8c5f316/bluepill,chulkilee/bluepill,chulkilee/bluepill,karlfreeman/bluepill,RallySoftware-cookbooks/bluepill,opscode-cookbooks/bluepill,faizk/bluepill,cookbooks/hw-bluepill,chef-cookbooks/bluepill,hw-cookbooks/bluepill,7bfa689ac3c4be50f8ba6c1ea8c5f316/bluepill,RallySoftware-cookbooks/bluepill,gswallow/bluepill,faizk/bluepill,VertiPub/bluepill,jtimberman/bluepill-cookbook,VertiPub/bluepill