fix: projects -> project's where applicable (#567)

Author: whilei

README.md

@@ -33,7 +33,7 @@ The [travis gem](https://rubygems.org/gems/travis) includes both a [command line
         * [`encrypt`](#encrypt) - encrypts values for the .travis.yml
         * [`encrypt-file`](#encrypt-file) - encrypts a file and adds decryption steps to .travis.yml
         * [`env`](#env) - show or modify build environment variables
-        * [`history`](#history) - displays a projects build history
+        * [`history`](#history) - displays a project's build history
         * [`init`](#init) - generates a .travis.yml and enables the project
         * [`logs`](#logs) - streams test logs
         * [`open`](#open) - opens a build or job in the browser
@@ -918,7 +918,7 @@ $ travis env unset foo bar
 
 #### `history`
 
-    Displays a projects build history.
+    Displays a project's build history.
     Usage: travis history [options]
         -h, --help                       Display help
         -i, --[no-]interactive           be interactive and colorful

lib/travis/cli/history.rb

@@ -3,7 +3,7 @@
 module Travis
   module CLI
     class History < RepoCommand
-      description "displays a projects build history"
+      description "displays a project's build history"
 
       on('-a', '--after BUILD', 'Only show history after a given build number')
       on('-p', '--pull-request NUMBER', 'Only show history for the given Pull Request')