Move readme example to where it works,

remove superfluous usage string.

yargs@>=7 throws exceptions on incorrectly structured builder objects.

Author: hugojosefson

bin/documentation.js

@@ -21,6 +21,7 @@ var argv = yargs
     }
   })
   .example('documentation build foo.js -f md > API.md')
+  .example('documentation readme index.js -s "API Docs" --github')
   .version()
   .usage(
     `Usage:

src/commands/readme.js

@@ -17,10 +17,6 @@ module.exports.description = 'inject documentation into your README.md';
  * @private
  */
 module.exports.builder = {
-  usage:
-    'Usage: documentation readme [--readme-file=README.md] --section "API"' +
-    ' [--compare-only] [other documentationjs options]',
-  example: 'documentation readme index.js -s "API Docs" --github',
   'readme-file': {
     describe: 'The markdown file into which to inject documentation',
     default: 'README.md'