~samwhited/cli

cli: fix typo in docs

Signed-off-by: Sam Whited <sam@samwhited.com>
.builds: fix CI and update to current BCP

Signed-off-by: Sam Whited <sam@samwhited.com>
cli: fix missing doc comment

Signed-off-by: Sam Whited <sam@samwhited.com>
.builds: sync to GitHub

Signed-off-by: Sam Whited <sam@samwhited.com>
.builds: verify DCO signature

Signed-off-by: Sam Whited <sam@samwhited.com>
.builds: move CI config into .builds tree

Signed-off-by: Sam Whited <sam@samwhited.com>
cli: don't mention old CommandSet in docs
cli: use FlagSet output instead of mutating it
ci: don't test Go 1.10 on Travis
ci: bump testing versions
cli: set supported language version
cli: parse flags in example
cli: test against Go 1.10 and Go 1.11
cli: clone via HTTPS in CI
cli: add CI config for builds.sr.ht
cli: remove auto help printing

Let the user print the help file if no such command is specified, or
there is nothing to run.
cli: simplify example code
support subcommands and remove CommandSet
Add Liberapay donate button

[ci skip]
ci: move to Travis CI
cli: no newline or capital on help error
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