Update README.rst to be python 3.11

Author: SylLutze

README.rst

@@ -23,7 +23,7 @@ Once you have all three installed, you should open up your normal shell
 You'll then make an environment, clone this repository, then install
 all necessary requirements as follows::
 
-  :~$ conda create --name=vivarium_gates_nutrition_optimization python=3.10
+  :~$ conda create --name=vivarium_gates_nutrition_optimization python=3.11
   ...conda will download python and base dependencies...
   :~$ conda activate vivarium_gates_nutrition_optimization
   (vivarium_gates_nutrition_optimization) :~$ git clone https://github.com/ihmeuw/vivarium_gates_nutrition_optimization.git
@@ -113,4 +113,4 @@ The country name should be in lower case, for example 'ethiopia' or 'nigeria'.
 The ``-vvv`` flag will log verbosely, so you will get log messages every time
 step. For more ways to run simulations, see the tutorials at
 https://vivarium.readthedocs.io/en/latest/tutorials/running_a_simulation/index.html
-and https://vivarium.readthedocs.io/en/latest/tutorials/exploration.html
+and https://vivarium.readthedocs.io/en/latest/tutorials/exploration.html