Use very strong ciphers (#4116)
Use very strong ciphers (#4116)

* Use very strong ciphers

* Remove TLS_RSA_WITH_AES_256_GCM_SHA384 to be compatible with Go 1.5

linquize/gogs,chriswatt/gogs,xaionaro/gogs,xaionaro/gogs,gogits/gogs,pikacloud/pikacode,psaavedra/gogs,ForxaCoLab/forxa,mukaiu/gogs,cgars/gogs,wangjild/gogs,xaionaro/gogs,cgars/gogs,dlob/gogs,pikacloud/pikacode,linquize/gogs,mukaiu/gogs,gogits/gogs,dancewing/gogs,chriswatt/gogs,Spice-King/gogs,dancewing/gogs,dancewing/gogs,mukaiu/gogs,chriswatt/gogs,ForxaCoLab/forxa,ForxaCoLab/forxa,psaavedra/gogs,linquize/gogs,gogits/gogs,cgars/gogs,pikacloud/pikacode,wangjild/gogs,dancewing/gogs,dlob/gogs,liliexuan/gogs,liliexuan/gogs,wangjild/gogs,dlob/gogs,psaavedra/gogs,Spice-King/gogs,Spice-King/gogs,liliexuan/gogs