prevent minimist from parsing an argument as an option value

otherwise:
`now -d /path`

would fail

protip cc @rase- @nkzawa

bin/now-alias

@@ -6,7 +6,10 @@ import login from '../lib/login';
 import * as cfg from '../lib/cfg';
 import { error } from '../lib/error';
 
-const argv = minimist(process.argv.slice(2));
+const argv = minimist(process.argv.slice(2), {
+  // all options are booleans
+  boolean: true
+});
 const subcommand = argv._[0];
 
 // options

bin/now-deploy

@@ -13,7 +13,11 @@ import Now from '../lib';
 import ms from 'ms';
 import { handleError, error } from '../lib/error';
 
-const argv = minimist(process.argv.slice(2));
+const argv = minimist(process.argv.slice(2), {
+  // all options are booleans
+  boolean: true
+});
+
 const help = () => {
   console.log(`
   ${chalk.bold('𝚫 now')} [options] <command | path>

bin/now-list

@@ -10,7 +10,11 @@ import login from '../lib/login';
 import * as cfg from '../lib/cfg';
 import { handleError, error } from '../lib/error';
 
-const argv = minimist(process.argv.slice(2));
+const argv = minimist(process.argv.slice(2), {
+  // all options are booleans
+  boolean: true
+});
+
 const help = () => {
   console.log(`
   ${chalk.bold('𝚫 now list')} [app]

bin/now-remove

@@ -9,7 +9,11 @@ import login from '../lib/login';
 import * as cfg from '../lib/cfg';
 import { handleError, error } from '../lib/error';
 
-const argv = minimist(process.argv.slice(2));
+const argv = minimist(process.argv.slice(2), {
+  // all options are booleans
+  boolean: true
+});
+
 const deploymentId = argv._[0];
 
 // options