Updated README.rst (#3651)

Removed BayesFit from the list of softwares using PyMC3 as their project has removed the dependency.

Author: vnherdeiro

README.rst

@@ -158,7 +158,6 @@ Software using PyMC3
 - `sampled <https://github.com/ColCarroll/sampled>`__: Decorator for PyMC3 models.
 - `NiPyMC <https://github.com/PsychoinformaticsLab/nipymc>`__: Bayesian mixed-effects modeling of fMRI data in Python.
 - `beat <https://github.com/hvasbath/beat>`__: Bayesian Earthquake Analysis Tool.
-- `BayesFit <https://github.com/Slugocm/BayesFit>`__: Bayesian Psychometric Curve Fitting Tool.
 
 Please contact us if your software is not listed here.