[feat] add support for request-received middleware (closes #76)

index.js

@@ -56,7 +56,7 @@ function dev (opts) {
 
   return async function logger (ctx, next) {
     // request
-    const start = Date.now()
+    const start = ctx[Symbol.for('request-received.startTime')] ? ctx[Symbol.for('request-received.startTime')].getTime() : Date.now()
     print('  ' + chalk.gray('<--') +
       ' ' + chalk.bold('%s') +
       ' ' + chalk.gray('%s'),