chore(deps): update dependency numpy to v1.18.4 [(#3675)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/3675)
chore(deps): update dependency numpy to v1.18.4 [(#3675)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/3675)

Co-authored-by: Bu Sun Kim <e20aa14702d7e04a52a901b5515eeecef97a5b5f@users.noreply.github.com>
Co-authored-by: Takashi Matsuo <f7c23db50f898cb58348f8ccc2931585dc97581a@google.com>
googleapis/python-language,googleapis/python-language