title: Error while importing Kaggle dataset on Colab
body: <p>When executing the following lines,</p>
  
  <pre><code>!pip install kaggle
  !kaggle competitions download -c dogs-vs-cats -p /content/
  </code></pre>
  
  <p>I got the following error messages,</p>
  
  <pre><code>Traceback (most recent call last):
  File "/usr/local/bin/kaggle", line 7, in &lt;module&gt;
  from kaggle.cli import main
  File "/usr/local/lib/python3.6/dist-packages/kaggle/__init__.py", line 23, in &lt;module&gt;
  api.authenticate()
  File "/usr/local/lib/python3.6/dist-packages/kaggle/api/kaggle_api_extended.py", line 109, in authenticate
  self._load_config(config_data)
  File "/usr/local/lib/python3.6/dist-packages/kaggle/api/kaggle_api_extended.py", line 151, in _load_config
  raise ValueError('Error: Missing %s in configuration.' % item)
  ValueError: Error: Missing username in configuration.
  </code></pre>
  
  <p>I don't know what just happened...same lines just worked fine before. It's the first time I found this problem.</p>