Allow pyyaml >= 5
Allow pyyaml >= 5

Current latest version is 5.1 so allow this version, too.

Change-Id: Ic349545720bf9a3d973fe863c7068d1e590732c3

gforcada/jenkins-job-builder,wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder,wsoula/jenkins-job-builder