Added aliases

Author: delvedor

cli.js

@@ -77,7 +77,9 @@ if (require.main === module) {
     string: ['log-level'],
     alias: {
       port: 'p',
-      help: 'h'
+      help: 'h',
+      'log-level': 'l',
+      'pretty-logs': 'P'
     },
     default: {
       port: 3000,

help.txt

@@ -2,10 +2,10 @@ Usage: fastify [opts] <file>
   -p, --port
       Port to listen on (default to 3000)
 
-  --log-level
+  -l, --log-level
       Log level (default to fatal)
 
-  --pretty-logs
+  -P, --pretty-logs
       Prints pretty logs
 
   -h, --help