Documentation: dependencies

[homocomputeris]

It is written that

matplotlib2tikz needs matplotlib and NumPy to work. matplotlib2tikz works both with Python 2 and Python 3.

Nevertheless, it doesn't work without pipdated (it's not clear why the it's needed for plotting, anyway) and Pillow:

from matplotlib2tikz import save as tikz_save
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-1cb291629c61> in <module>()
      1 import matplotlib.pyplot as plt
      2 import numpy as np
----> 3 from matplotlib2tikz import save as tikz_save
      4 
      5 plt.style.use('ggplot')

/usr/lib/python3.6/site-packages/matplotlib2tikz/__init__.py in <module>()
     18 from matplotlib2tikz.save import get_tikz_code, save
     19 
---> 20 import pipdated
     21 if pipdated.needs_checking(__name__):
     22     print(pipdated.check(__name__, __version__))

ModuleNotFoundError: No module named 'pipdated'

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-1cb291629c61> in <module>()
      1 import matplotlib.pyplot as plt
      2 import numpy as np
----> 3 from matplotlib2tikz import save as tikz_save
      4 
      5 plt.style.use('ggplot')

/usr/lib/python3.6/site-packages/matplotlib2tikz/__init__.py in <module>()
     16         )
     17 
---> 18 from matplotlib2tikz.save import get_tikz_code, save
     19 
     20 import pipdated

/usr/lib/python3.6/site-packages/matplotlib2tikz/save.py in <module>()
     11 from . import legend
     12 from . import line2d
---> 13 from . import image as img
     14 from . import quadmesh as qmsh
     15 from . import path

/usr/lib/python3.6/site-packages/matplotlib2tikz/image.py in <module>()
      5 import matplotlib as mpl
      6 import numpy
----> 7 import PIL
      8 
      9 

ModuleNotFoundError: No module named 'PIL'

[nschloe]

Fixed via cbdc8bdbe10ccc2903e7f43ebb4199d2ce9cde0e.