Fix now alias failing when now.json doesn’t define deployment type (#321)

lib/read-metadata.js

@@ -1,6 +1,6 @@
 const {basename, resolve: resolvePath} = require('path')
 const chalk = require('chalk')
-const {readFile} = require('fs-promise')
+const {readFile, exists} = require('fs-promise')
 const {parse: parseDockerfile} = require('docker-file-parser')
 
 const listPackage = {
@@ -45,6 +45,8 @@ async function readMetaData(path, {
     // when both a package.json and Dockerfile exist
     if (nowConfig.type) {
       deploymentType = nowConfig.type
+    } else if (nowConfig.type === undefined && !await exists(resolvePath(path, 'package.json'))) {
+      deploymentType = 'static'
     }
     if (nowConfig.name) {
       deploymentName = nowConfig.name