Update README to state that golang 1.6 is required for development.
Update README to state that golang 1.6 is required for development.

- it is the only version we CI against, so do not try to support other versions.

[#126563545]

crawsible/pivnet-resource,crawsible/pivnet-resource,pivotal-cf-experimental/pivnet-resource,pivotal-cf-experimental/pivnet-resource