feat(README): add the history doc link
feat(README): add the history doc link

After d1488f1d9448afc55b20653ebdf26d7b8a9e9cad I forgot to add this to
the TOC.

kdada/helm,SlickNik/helm,kdada/helm,rbwsam/helm,technosophos/k8s-helm,FengyunPan/helm,bacongobbler/helm,technosophos/deployment-manager,appscode/helm,adamreese/deployment-manager,adamreese/deployment-manager,sushilkm/helm,yan234280533/helm,technosophos/deployment-manager,sushilkm/helm,adamreese/deployment-manager,fibonacci1729/helm,jascott1/helm,eicnix/helm,technosophos/deployment-manager,thomastaylor312/helm,flynnduism/helm,bradj/helm,rbwsam/helm,michelleN/deployment-manager,SlickNik/helm,helm/helm,adamreese/deployment-manager,qwangrepos/helm,michelleN/deployment-manager,vaikas-google/deployment-manager,bradj/helm,iamzhout/helm,helm/helm,technosophos/k8s-helm,technosophos/deployment-manager,adamreese/helm,michelleN/deployment-manager,michelleN/deployment-manager,iamzhout/helm,eicnix/helm,qwangrepos/helm,adamreese/helm,appscode/helm,jascott1/helm,bacongobbler/helm,yan234280533/helm,technosophos/deployment-manager,fibonacci1729/helm,thomastaylor312/helm,adamreese/deployment-manager,FengyunPan/helm,vaikas-google/deployment-manager,flynnduism/helm