Fix running on Travis-Ci

.travis.yml

@@ -3,6 +3,7 @@ node_js:
   - "7"
 dist: trusty
 env:
+  - DISABLE_CHROMIUM_SANDBOX=true
 cache:
   yarn: true
   directories:

lib/Browser.js

@@ -51,6 +51,8 @@ class Browser {
                 `--disable-gpu`,
             ]);
         }
+        if (process.env['DISABLE_CHROMIUM_SANDBOX'])
+            this._chromeArguments.push('--no-sandbox');
         if (typeof options.executablePath === 'string') {
             this._chromeExecutable = options.executablePath;
         } else {