Typo in help command

[NickHeiner]

The help command outputs:

λ travis | grep history
	history                displays a projects build history

It should be "project's", not "projects".

λ travis report
System
Ruby:                     Ruby 2.2.4-p230
Operating System:         Mac OS X 10.12.6
RubyGems:                 RubyGems 2.4.5.1

CLI
Version:                  1.8.8
Plugins:                  none
Auto-Completion:          yes
Last Version Check:       2017-09-19 11:16:49 -0400

Session
API Endpoint:             https://api.travis-ci.org/
Logged In:                as "nickheiner-usds"
Verify SSL:               yes
Enterprise:               no

Endpoints
org:                      https://api.travis-ci.org/ (access token, current)

[BanzaiMan]

Resolved by #567.