Update python version in installation instructions

README.md

@@ -16,13 +16,14 @@
 
 ## Contents
 
-* [About](#about)
-* [Quick start](#quick-start)
-* [Documentation](#documentation)
-* [Contributing](#contributing)
-* [What's new](#whats-new)
-* [Citing Calliope](#citing-calliope)
-* [License](#license)
+- [Contents](#contents)
+- [About](#about)
+- [Quick start](#quick-start)
+- [Documentation](#documentation)
+- [Contributing](#contributing)
+- [What's new](#whats-new)
+- [Citing Calliope](#citing-calliope)
+- [License](#license)
 
 ---
 
@@ -36,7 +37,7 @@ Calliope comes with several built-in analysis and visualisation tools. Having so
 
 ## Quick start
 
-Calliope can run on Windows, macOS and Linux. Installing it is quickest with the `conda` package manager by running a single command: `conda create -c conda-forge -n calliope python=3.6 calliope`.
+Calliope can run on Windows, macOS and Linux. Installing it is quickest with the `conda` package manager by running a single command: `conda create -c conda-forge -n calliope calliope`.
 
 See the documentation for more [information on installing](https://calliope.readthedocs.io/en/stable/user/installation.html).
 

doc/user/installation.rst

@@ -11,7 +11,7 @@ Calliope has been tested on Linux, macOS, and Windows.
 
 Running Calliope requires four things:
 
-1. The Python programming language, version 3.6 or higher.
+1. The Python programming language, version 3.7 or higher.
 2. A number of Python add-on modules (see :ref:`below for the complete list <python_module_requirements>`).
 3. A solver: Calliope has been tested with CBC, GLPK, Gurobi, and CPLEX. Any other solver that is compatible with Pyomo should also work.
 4. The Calliope software itself.
@@ -23,11 +23,11 @@ The easiest way to get a working Calliope installation is to use the free ``cond
 
 To get ``conda``, `download and install the "Miniconda" distribution for your operating system <https://conda.io/miniconda.html>`_ (using the version for Python 3).
 
-With Miniconda installed, you can create a new Python 3.6 environment called ``"calliope"`` with all the necessary modules, including the free and open source GLPK solver, by running the following command in a terminal or command-line window
+With Miniconda installed, you can create a new environment called ``"calliope"`` with all the necessary modules, including the free and open source GLPK solver, by running the following command in a terminal or command-line window
 
   .. code-block:: fishshell
 
-    $ conda create -c conda-forge -n calliope python=3.6 calliope
+    $ conda create -c conda-forge -n calliope calliope
 
 To use Calliope, you need to activate the ``calliope`` environment each time