Update go version in travis config
Update go version in travis config

Signed-off-by: Ashutosh Narkar <334e9094b46d3151817f829cebfa78d0453b0333@gmail.com>

tsandall/contrib,open-policy-agent/contrib,open-policy-agent/contrib,tsandall/contrib,tsandall/contrib,open-policy-agent/contrib,open-policy-agent/contrib,tsandall/contrib,open-policy-agent/contrib,open-policy-agent/contrib,open-policy-agent/contrib,open-policy-agent/contrib,tsandall/contrib,tsandall/contrib,tsandall/contrib