☁ Google Chrome Headless mode

Now the default is set to the headless mode for the browser. You don't have to see the window anymore.

💻 Can use environment variable to give your id & password

Now, you can use the following environment variables to set your identity:

• MANABA_USERNAME: your student ID (i.e. 201713094)
• MANABA_PASSWORD: your password (i.e. password)

🎉 Initial Release

Merge pull request #1 from shuuji3/add-license-1

Create LICENSE