Update version number

README.rst

@@ -15,21 +15,17 @@ Bayesian Psychometric Curve Fitting tool
 
 NEWS: 
 
-**VERSION 2.0 NOW RELEASED!  PLEASE READ RELEASE NOTES AS SIGNIFICANT CHANGES HAVE BEEN MADE**
+**VERSION 2.2 NOW RELEASED!**
 
 Release Notes
 ------------------
 
-Release 2.0 (noteable mentions):
+Release 2.2 (noteable mentions):
 
-- **BayeFit has switched from use of pystan to pyMC3. We feel that this module is better suited for our purposes, and also has less overhead for Windows users** 
-- Entirely new function for model fitting that does everything in one shot!
-- Batch fitting has now been released with greater ease of use. The same function as for fitting a model to a single dataset is used.
-- A function to perform the Geweke diagnostic test for convergence of chains has been added.
-- Unit tests on all functions have been updated, and a coverage report (badge above) has been posted on the BayesFit read me page.
-- Added additional safeguards for using options that are not permitted have been added. 
+- Added ability to define priors for each parameter of model
+- Altered default priors to promote efficient sampling of posterior
 
-Link to v2.0 in PyPI archive (https://pypi.org/project/bayesfit/)
+Link to v2.2 in PyPI archive (https://pypi.org/project/bayesfit/)
 
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