Update README.rst

README.rst

@@ -15,7 +15,7 @@ Download the latest version from the `GitHub repository <https://github.com/acha
 
     pip install .
 
-It should install the depended libraries `astropy <http://www.astropy.org/>`_, `ephem <http://pypi.python.org/pypi/pyephem/>`_, `future <http://pypi.python.org/pypi/future>`_, `matplotlib <http://www.matplotlib.org/>`_, `numpy <http://www.numpy.org/>`_, `scipy <http://www.scipy.org/>`_, `pandas <http://www.pandas.pydata.org/>`_ automatically.
+It should install the necessary libraries `astropy <http://www.astropy.org/>`_, `ephem <http://pypi.python.org/pypi/pyephem/>`_, `future <http://pypi.python.org/pypi/future>`_, `matplotlib <http://www.matplotlib.org/>`_, `numpy <http://www.numpy.org/>`_, `scipy <http://www.scipy.org/>`_, `pandas <http://www.pandas.pydata.org/>`_ automatically.
 
 If you want to use fast fourier transforms, you will also need to install `NFFT <https://github.com/NFFT/nfft>`_ and the `pynnft wrapper <https://github.com/ghisvail/pyNFFT/>`_ before installing ehtim. The simplest way is to use `conda <https://anaconda.org/conda-forge/pynfft/>`__ to to install both NFFT and the pynfft wrapper.