text: Title: I can not install giotto.
  Body: I a, using ubuntu and in python3.5 and python 3.7 I can not install giotto. How can I install it simply?
  
  `Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-xsyfhd6s/giotto-learn/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-blrgq5ld/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-install-xsyfhd6s/giotto-learn/`
  