update readme

README.md

@@ -4,36 +4,54 @@
 
 [![Build Status](https://travis-ci.org/heroku/heroku-buildpack-python.svg?branch=master)](https://travis-ci.org/heroku/heroku-buildpack-python)
 
-This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps, powered by [Pipenv](http://docs.pipenv.org/), [pip](https://pip.pypa.io/) and other excellent software.
+This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps.
 
-Recommended web frameworks include **Django** and **Flask**. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
+Recommended web frameworks include **Django** and **Flask**, among others. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
 
-Python packages with C dependencies that are not [available on the stack image](https://devcenter.heroku.com/articles/stack-packages) are generally not supported, unless `manylinux` wheels are provided by the package maintainers (common). For recommended solutions, check out [this article](https://devcenter.heroku.com/articles/python-c-deps) for more information. 
+Python packages with C dependencies that are not [available on the stack image](https://devcenter.heroku.com/articles/stack-packages) are generally not supported, unless `manylinux` wheels are provided by the package maintainers (common). For recommended solutions, check out [this article](https://devcenter.heroku.com/articles/python-c-deps) for more information.
 
 See it in Action
 ----------------
+```
+$ ls
+my-application		requirements.txt	runtime.txt
+
+$ git push heroku master
+Counting objects: 4, done.
+Delta compression using up to 8 threads.
+Compressing objects: 100% (2/2), done.
+Writing objects: 100% (4/4), 276 bytes | 276.00 KiB/s, done.
+Total 4 (delta 0), reused 0 (delta 0)
+remote: Compressing source files... done.
+remote: Building source:
+remote:
+remote: -----> Python app detected
+remote: -----> Installing python-3.7.1
+remote: -----> Installing pip
+remote: -----> Installing SQLite3
+remote: -----> Installing requirements with pip
+remote:        Collecting flask (from -r /tmp/build_c2c067ef79ff14c9bf1aed6796f9ed1f/requirements.txt (line 1))
+remote:          Downloading ...
+remote:        Installing collected packages: Werkzeug, click, MarkupSafe, Jinja2, itsdangerous, flask
+remote:        Successfully installed Jinja2-2.10 MarkupSafe-1.1.0 Werkzeug-0.14.1 click-7.0 flask-1.0.2 itsdangerous-1.1.0
+remote:
+remote: -----> Discovering process types
+remote:        Procfile declares types -> (none)
+remote:
+```
 
-Deploying a Python application couldn't be easier:
+A `requirements.txt` must be present at the root of your application's repository to deploy.
 
-    $ ls
-    Pipfile		Pipfile.lock	Procfile	web.py
+To specify your python version, you also need a `runtime.txt` file - unless you are using the default Python runtime version.
 
-    $ heroku create --buildpack heroku/python
+Current default Python Runtime: Python 3.6.7
 
-    $ git push heroku master
-    …
-    -----> Python app detected
-    -----> Installing python-3.6.6
-    -----> Installing pip
-    -----> Installing requirements with Pipenv 2018.5.18…
-           ...
-           Installing dependencies from Pipfile…
-    -----> Discovering process types
-           Procfile declares types -> (none)
+Alternatively, you can provide a `setup.py` file, or a `Pipfile`. Using `Pipenv` will generate `runtime.txt` based on `python-version` at build time.
 
-A `Pipfile` or `requirements.txt` must be present at the root of your application's repository.
+Specify a Buildpack Version
+---------------------------
 
-You can also specify the latest production release of this buildpack for upcoming builds of an existing application:
+You can specify the latest production release of this buildpack for upcoming builds of an existing application:
 
     $ heroku buildpacks:set heroku/python
 
@@ -41,25 +59,10 @@ You can also specify the latest production release of this buildpack for upcomin
 Specify a Python Runtime
 ------------------------
 
-Specific versions of the Python runtime can be specified in your `Pipfile`:
-
-    [requires]
-    python_version = "2.7"
-
-Or, more specifically:
-
-    [requires]
-    python_full_version = "2.7.15"
-
-Or, with a `runtime.txt` file:
-
-    $ cat runtime.txt
-    python-2.7.15
-
-Runtime options include:
+Supported runtime options include:
 
-- `python-3.7.0`
-- `python-3.6.6`
+- `python-3.7.1`
+- `python-3.6.7`
 - `python-2.7.15`
 
 ## Tests
@@ -82,4 +85,4 @@ make test-heroku-16
 
 The tests are run via the vendored
 [shunit2](https://github.com/kward/shunit2)
-test framework.
\ No newline at end of file
+test framework.