Import error in colab


A minor issue upon setting up fastbook on colab, I am getting below error

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
google-colab 1.0.0 requires tornado~=5.1.0; python_version >= "3.0", but you have tornado 6.1 which is incompatible.
AttributeError                            Traceback (most recent call last)
<ipython-input-1-d4b7c5385581> in <module>()
      1 get_ipython().system('pip install -Uqq fastbook')
----> 2 import fastbook
      3 fastbook.setup_book()

10 frames
/usr/local/lib/python3.7/dist-packages/tornado/ in BaseIOStream()
    284         self._closed = False
--> 286     def fileno(self) -> Union[int, ioloop._Selectable]:
    287         """Returns the file descriptor for this stream."""
    288         raise NotImplementedError()

AttributeError: module 'tornado.ioloop' has no attribute '_Selectable'

note: It is not a major blocker can be mitigated by adding

!pip install tornado==5.1