Lint is broken

[sduskis]

It looks like there were some recent lint changes. We need to address new breakages

@google-cloud/bigtable@0.16.1 lint /home/node/project
eslint src/ samples/ system-test/ test/

/home/node/project/samples/hello-world/index.v6.js
15:20 error "co" is not found node/no-missing-require

/home/node/project/system-test/read-rows-acceptance-tests.js
59:17 error Replace .filter(result·=>·!result.error) with ⏎········.filter(result·=>·!result.error)⏎········ prettier/prettier
60:1 error Insert ·· prettier/prettier
61:1 error Insert ·· prettier/prettier
62:9 error Insert ·· prettier/prettier
63:1 error Insert ·· prettier/prettier
64:11 error Insert ·· prettier/prettier
65:1 error Replace ········ with ·········· prettier/prettier
66:1 error Insert ·· prettier/prettier
67:1 error Replace ········ with ·········· prettier/prettier
68:1 error Insert ·· prettier/prettier
69:1 error Replace ········ with ·········· prettier/prettier
70:9 error Insert ·· prettier/prettier
71:1 error Replace ········ with ·········· prettier/prettier
72:1 error Insert ·· prettier/prettier
73:9 error Insert ·· prettier/prettier
74:1 error Insert ·· prettier/prettier
75:11 error Insert ·· prettier/prettier
76:1 error Replace ·········· with ············ prettier/prettier
77:1 error Insert ·· prettier/prettier
78:9 error Insert ·· prettier/prettier
79:1 error Insert ·· prettier/prettier

✖ 22 problems (22 errors, 0 warnings)
21 errors and 0 warnings potentially fixable with the --fix option.