params: mark Geth v1.6.5 stable (Hat Trick)

params: Geth 1.6.4 stable (hotfix)

params: release Geth 1.6.3 - Covfefe

params: 1.6.2 stable

params: release Geth 1.6.1, Deripors of Ohratuu

params: release Geth 1.6.0, Puppeth Master

Merge pull request ethereum#3671 from karalabe/1.5.9-stable

params: 1.5.9 stable

params: v1.5.8-stable

params: stable 1.5.7

Merge pull request ethereum#3537 from karalabe/release-1.5.6

params: stable version 1.5.6