Remove bootstrap.py

It leads to update loops when running `bin/buildout -n` for the first time.
When omitting `-n` the setuptools version might be too old.

CHANGES.rst

@@ -16,6 +16,9 @@ Breaking changes
 
 - Remove the ``OFS.History`` module which contained only BBB code since 4.0a2.
 
+- Remove `bootstrap.py`. To install Zope via `zc.buildout` install the
+  `zc.buildout` package in a virtual environment at first.
+
 New features
 ++++++++++++
 

docs/INSTALL-buildout.rst

@@ -26,6 +26,7 @@ available:
   * 2.7
   * 3.5
   * 3.6
+  * 3.7
 
 - Zope needs the Python ``zlib`` module to be importable.  If you are
   building your own Python from source, please be sure that you have the
@@ -55,21 +56,29 @@ steps:
 
 - Run the buildout
 
+You may need to replace the used Zope version used in the examples (4.0b6) with
+ he one you actually want to install.
+
 On Linux, this can be done as follows::
 
-  $ wget https://pypi.python.org/packages/source/Z/Zope/Zope-<Zope version>.tar.gz
+  $ wget https://pypi.python.org/packages/source/Z/Zope/Zope-4.0b6.tar.gz
   $ tar xfvz Zope-<Zope version>.tar.gz
   $ cd Zope-<Zope version>
-  $ /path/to/your/python bootstrap.py
-  $ bin/buildout -n
+  $ python3.7 -m venv .
+  $ bin/pip install -U pip zc.buildout
+  $ bin/buildout
 
 .. note::
-  Instead of using the buildout configuration shipping with Zope itself, you
-  can also start with a minimum configuration like this::
+
+  When using Python 2.7 instead of calling ``python3.7 -m venv .`` you have to
+  install `virtualenv` and then call ``virtualenv-2.7 .``.
+
+Instead of using the buildout configuration shipping with Zope itself, you
+can also start with a minimum configuration like this::
 
     [buildout]
     extends =
-        https://zopefoundation.github.io/Zope/releases/master/versions-prod.cfg
+        https://zopefoundation.github.io/Zope/releases/4.0b6/versions-prod.cfg
     parts =
         zopescripts
         zopepy

setup.cfg

@@ -1,6 +1,5 @@
 [flake8]
 ignore = C901,N801,N802,N803,N805,N806,N812,E301
-exclude = bootstrap.py
 
 [bdist_wheel]
 universal = 1

versions.cfg

@@ -35,7 +35,6 @@ pyparsing = 2.2.0
 python-gettext = 3.0
 requests = 2.18.4
 requests-toolbelt = 0.8.0
-setuptools = 39.1.0
 snowballstemmer = 1.2.1
 Sphinx = 1.7.4
 sphinxcontrib-websupport = 1.0.1
@@ -47,7 +46,6 @@ urllib3 = 1.22
 virtualenv = 16.0.0
 wheel = 0.31.1
 z3c.checkversions = 1.0
-zc.buildout = 2.11.4
 zc.recipe.egg = 2.0.5
 zc.recipe.testrunner = 2.0.0
 zest.releaser = 6.15.0