Wsgi middleware that exposes an app's version number

## Project description

Adds a /version url that returns a json response of the current application version.

Example usage:

from wsgiappversion import ApplicationVersion
from my_project import MyWSGIApp

application = MyWSGIApp()
application = ApplicationVersion(application, determine_version='my_project')

The required determine_version argument is used to determine what the current version actually is. determine_version can be either a string or a callable that takes no arguments. When a string is used then the version is determined by calling pkg_resources.require(package_name). If that would not work for your application then a callable that returns the correct version can be used.

Since a package version would likely not change without an application restart we would recommend using a closure (or some other similar method of caching a value) as your callable.

## Project details

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