prepare release to deprecate the tool.

* require tox < 3.7
* add a note in the README about its status
* add a warning at the end of the testrun to consider switching

CHANGELOG

@@ -1,8 +1,14 @@
 # CHANGELOG
 
+## 0.19
+
+- as tox added a parallel mode in 3.7 detox will only work with older versions of tox now so the installation requires a version of tox < 3.7
+- mark repository as unmaintained
+- add a warning at the end of the testrun hinting the user to try it without detox and a version of tox > 3.6
+
 ## 0.18
 
-Note that usedevlop still does not seem to be fixed (PRs welcome)
+Note that usedevelop still does not seem to be fixed (PRs welcome)
 
 - integrate usable fixes from stale PR7
     - (fix [#20](https://github.com/tox-dev/detox/issues/20) detox

README.md

@@ -1,3 +1,11 @@
+[![Project Status: Unsupported – The project has reached a stable, usable state but the author(s) have ceased all work on it. A new maintainer may be desired.](https://www.repostatus.org/badges/latest/unsupported.svg)](https://www.repostatus.org/#unsupported)
+
+# detox is unmaintained and incompatible with tox > 3.6
+
+`detox` was a plugin for [`tox`](https://pypi.org/project/tox/) to enable parallel environment execution. `tox` 3.7 added a native possibility to do this (`tox -p|--parallel`) and effectively supercedes detox.
+
+---
+
 [![Build Status](https://travis-ci.org/tox-dev/detox.svg?branch=master)](https://travis-ci.org/tox-dev/detox)
 [![Latest Version on PyPI](https://badge.fury.io/py/detox.svg)](https://badge.fury.io/py/detox)
 [![Supported Python Versions](https://img.shields.io/pypi/pyversions/detox.svg)](https://pypi.org/project/detox/)

detox/__init__.py

@@ -1 +1 @@
-__version__ = "0.18"
+__version__ = "0.19"

setup.py

@@ -15,7 +15,7 @@ def make_long_description():
     description="distributing activities of the tox tool",
     long_description=make_long_description(),
     long_description_content_type="text/markdown",
-    version="0.18",  # Note: keep in sync with detox/__init__.py
+    version="0.19",  # Note: keep in sync with detox/__init__.py
     url="https://github.com/tox-dev/detox",
     license="MIT",
     platforms=["unix", "linux", "osx", "cygwin", "win32"],
@@ -40,7 +40,7 @@ def make_long_description():
         "Programming Language :: Python",
     ],
     packages=["detox"],
-    install_requires=["tox>=3.5,<4", "py>=1.4.27", "eventlet>=0.15.0"],
+    install_requires=["tox>=3.5,<3.7", "py>=1.4.27", "eventlet>=0.15.0"],
     extras_require={"lint": ["black", "flake8"], "dev": ["pytest >= 3.8"]},
     entry_points={
         "console_scripts": "detox=detox.cli:main",