Bump github.com/alecthomas/kong from 0.2.17 to 0.2.22

[dependabot[bot]]

Bumps github.com/alecthomas/kong from 0.2.17 to 0.2.22.

Commits

• 7533b11 Differentiate between omitted and empty default.
• 9c9b8ab More enum fixes.
• fa08e70 fix: overly enthusiastic validation of tags
• ece1f6d Allow more flexible callback return error type.
• deebf0b Do not add environment variable to help it is already present.
• 32b2f74 Support $$ for escaping $ in interpolated values.
• c5e464a Deprecate HelpFormatter.
• c3703cd Fix that default should not override the placeholder.
• d564bd2 Add test for #244.
• 342263c Fix docs re. Help() interface.
• Additional commits viewable in compare view

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[coveralls]

Coverage decreased (-0.5%) to 44.225% when pulling a1d3041d1716882725721aabacb151d23f734014 on dependabot/go_modules/github.com/alecthomas/kong-0.2.22 into 9eb9c131416fb042dba42edcebb180dbb951e091 on master.

[dependabot[bot]]

Superseded by #114.