title: Mutt: Goobook Installation OK, but then it does not work
body: <p>I run debian stretch on my box. Until a few days ago, everything was fine with my mutt+goobook+gmail, but recently I have experienced some problems.
  I tried reinstalling goobook and apparently that works fine</p>
  
  <pre><code>$ sudo pip install goobook
  Collecting goobook
  Requirement already satisfied: simplejson&gt;=2.1.0 in /usr/local/lib/python2.7/dist-packages    /simplejson-3.16.0-py2.7.egg (from goobook)
  Requirement already satisfied: google-api-python-client&gt;=1.6.4 in /usr/local/lib/python2.7/dist-   packages/google_api_python_client-1.7.4-py2.7.egg (from goobook)
  Requirement already satisfied: oauth2client&lt;5.0.0dev,&gt;=1.5.0 in /usr/local/lib/python2.7/dist-packages/oauth2client-4.1.3-py2.7.egg (from goobook)
  Requirement already satisfied: google-auth-httplib2&gt;=0.0.3 in /usr/local/lib/python2.7/dist-packages/google_auth_httplib2-0.0.3-py2.7.egg (from google-api-python-client&gt;=1.6.4-&gt;goobook)
  Requirement already satisfied: google-auth&gt;=1.4.1 in /usr/local/lib/python2.7/dist-packages/google_auth-1.5.1-py2.7.egg (from google-api-python-client&gt;=1.6.4-&gt;goobook)
  Requirement already satisfied: httplib2&lt;1dev,&gt;=0.9.2 in /usr/lib/python2.7/dist-packages (from google-api-python-client&gt;=1.6.4-&gt;goobook)
  Requirement already satisfied: six&lt;2dev,&gt;=1.6.1 in /usr/lib/python2.7/dist-packages (from google-api-python-client&gt;=1.6.4-&gt;goobook)
  Requirement already satisfied: uritemplate&lt;4dev,&gt;=3.0.0 in /usr/local/lib/python2.7/dist-packages/uritemplate-3.0.0-py2.7.egg (from google-api-python-client&gt;=1.6.4-&gt;goobook)
  Requirement already satisfied: pyasn1-modules&gt;=0.0.5 in /usr/lib/python2.7/dist-packages (from oauth2client&lt;5.0.0dev,&gt;=1.5.0-&gt;goobook)
  Requirement already satisfied: pyasn1&gt;=0.1.7 in /usr/lib/python2.7/dist-packages (from oauth2client&lt;5.0.0dev,&gt;=1.5.0-&gt;goobook)
  Requirement already satisfied: rsa&gt;=3.1.4 in /usr/local/lib/python2.7/dist-packages/rsa-4.0-py2.7.egg (from oauth2client&lt;5.0.0dev,&gt;=1.5.0-&gt;goobook)
  Requirement already satisfied: cachetools&gt;=2.0.0 in /usr/local/lib/python2.7/dist-packages/cachetools-2.1.0-py2.7.egg (from google-auth&gt;=1.4.1-&gt;google-api-python-client&gt;=1.6.4-&gt;goobook)
  Installing collected packages: goobook
  Successfully installed goobook-3.1
  </code></pre>
  
  <p>but then for instance</p>
  
  <pre><code>$ goobook reload
  Traceback (most recent call last):
   File "/usr/local/bin/goobook", line 7, in &lt;module&gt;
   from goobook.application import main
    File "/usr/local/lib/python2.7/dist-packages/goobook/application.py", line 21, in &lt;module&gt;
   import goobook.config
   File "/usr/local/lib/python2.7/dist-packages/goobook/goobook.py", line 99
    print("-------------------------", file=out)
                                     ^
    SyntaxError: invalid syntax
  </code></pre>
  
  <p>Does anybody else experience that? Any idea about how to fix this?
  Thanks!</p>