build: --credential-file-override is no longer required (#470)
build: --credential-file-override is no longer required (#470)

Source-Author: Benjamin E. Coe <69440dae14aaa9fe2429b324bfce03449d09e1db@google.com>
Source-Date: Fri Aug 7 19:02:09 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 94421c47802f56a44c320257b2b4c190dc7d6b68
Source-Link: https://github.com/googleapis/synthtool/commit/94421c47802f56a44c320257b2b4c190dc7d6b68
googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node