adding runtime to preparing
MODIFY
docs/source/usage.rst
docs/source/usage.rst
@@ -57,6 +57,9 @@ Supported configuration files
Below is a list of supported configuration files.
+.. contents::
+ :local:
+
``requirements.txt``
^^^^^^^^^^^^^^^^^^^^
@@ -101,6 +104,13 @@ This specifies a list of Julia packages!
Using a ``REQUIRE`` file also requires that the repository contain an
``environment.yml`` file.
+``runtime.txt``
+^^^^^^^^^^^^^^^
+
+This allows you to control the runtime of Python. To use Python 2,
+put the line ``python-2.7`` in the file. A Python 2 kernel will be installed
+alongside Python 3.
+
``Dockerfile``
^^^^^^^^^^^^^^

adding runtime to preparing