Update mergeable.yml to remove fail action
Update mergeable.yml to remove fail action

Resolves #3504
EPTamminga/Dnn.Platform,EPTamminga/Dnn.Platform,valadas/Dnn.Platform,nvisionative/Dnn.Platform,valadas/Dnn.Platform,dnnsoftware/Dnn.Platform,valadas/Dnn.Platform,bdukes/Dnn.Platform,mitchelsellers/Dnn.Platform,mitchelsellers/Dnn.Platform,dnnsoftware/Dnn.Platform,bdukes/Dnn.Platform,mitchelsellers/Dnn.Platform,EPTamminga/Dnn.Platform,nvisionative/Dnn.Platform,dnnsoftware/Dnn.Platform,dnnsoftware/Dnn.Platform,nvisionative/Dnn.Platform,mitchelsellers/Dnn.Platform,valadas/Dnn.Platform,valadas/Dnn.Platform,dnnsoftware/Dnn.Platform,mitchelsellers/Dnn.Platform,bdukes/Dnn.Platform,bdukes/Dnn.Platform