require mathics==0.9 and update README

Author: sn6uv

README.md

@@ -1,8 +1,6 @@
 A Jupyter kernel for mathics
 ----------------------------
 
-Currently only works with the github version of Mathics.
-
-Planned to work with Mathics 0.9.
+Requires Mathics 0.9.
 
 [![Build Status](https://travis-ci.org/mathics/IMathics.svg?branch=master)](https://travis-ci.org/mathics/IMathics)

setup.py

@@ -11,8 +11,7 @@
 # General Requirements
 SETUP_REQUIRES = ['ipython', 'ipykernel']
 
-# TODO relies on 'mathics' sn6uv/Mathics jupyter branch
-INSTALL_REQUIRES = [] + SETUP_REQUIRES
+INSTALL_REQUIRES = ['mathics==0.9'] + SETUP_REQUIRES
 
 
 kernel_json = {