Update README for cli switch value clarity

Booleans current MUST be lowercase.
Improved Markdown for presenting cli values.

Author: BigBlueHat

README.md

@@ -33,33 +33,33 @@ This will install `http-server` globally so that it may be run from the command
 
 `-a` Address to use (defaults to 0.0.0.0)
 
-`-d` Show directory listings (defaults to 'True')
+`-d` Show directory listings (defaults to `true`)
 
-`-i` Display autoIndex (defaults to 'True')
+`-i` Display autoIndex (defaults to `true`)
 
-`-g` or `--gzip` When enabled (defaults to 'False') it will serve `./public/some-file.js.gz` in place of `./public/some-file.js` when a gzipped version of the file exists and the request accepts gzip encoding.
+`-g` or `--gzip` When enabled (defaults to `false`) it will serve `./public/some-file.js.gz` in place of `./public/some-file.js` when a gzipped version of the file exists and the request accepts gzip encoding.
 
-`-e` or `--ext` Default file extension if none supplied (defaults to 'html')
+`-e` or `--ext` Default file extension if none supplied (defaults to `html`)
 
 `-s` or `--silent` Suppress log messages from output
 
 `--cors` Enable CORS via the `Access-Control-Allow-Origin` header
 
 `-o` Open browser window after starting the server
 
-`-c` Set cache time (in seconds) for cache-control max-age header, e.g. -c10 for 10 seconds (defaults to '3600'). To disable caching, use -c-1.
+`-c` Set cache time (in seconds) for cache-control max-age header, e.g. `-c10` for 10 seconds (defaults to `3600`). To disable caching, use `-c-1`.
 
 `-U` or `--utc` Use UTC time format in log messages.
 
 `-P` or `--proxy` Proxies all requests which can't be resolved locally to the given url. e.g.: -P http://someurl.com
 
 `-S` or `--ssl` Enable https.
 
-`-C` or `--cert` Path to ssl cert file (default: cert.pem).
+`-C` or `--cert` Path to ssl cert file (default: `cert.pem`).
 
-`-K` or `--key` Path to ssl key file (default: key.pem).
+`-K` or `--key` Path to ssl key file (default: `key.pem`).
 
-`-r` or `--robots` Provide a /robots.txt (whose content defaults to 'User-agent: *\nDisallow: /')
+`-r` or `--robots` Provide a /robots.txt (whose content defaults to `User-agent: *\nDisallow: /`)
 
 `-h` or `--help` Print this list and exit.