Make 4.0.0 releasev4.0.0

Includes a small API behavior change, hence the major version bump:

 - db63301 ("Return "" for unwritten symbols in Symbol.config_string")

New features:

 - Support for incremental builds using the same scheme as the
   include/config/ directory in the C tools. See the new
   Kconfig.sync_deps() function and commit 378dedc ("Add support for
   incremental builds").

 - Minimal configuration (defconfig) writing, generating identical files
   to the C implementation. See commit 652f11b ("Add minimal
   configuration file generation support").

   The C 'make savedefconfig' implementation is currently broken in
   obscure cases involving tristate choices (due to broken invalidation
   code), so the tests are disabled for now. I have a patch for the C
   implementation that I will submit.

Fixes:

 - user_value wasn't set for choice symbols set to y via load_config()
   with replace=True. Fixed by commit 0bd841d ("Properly remember y user
   values for choice symbols"). Didn't affect correctness, only the API.

Other changes:

 - 778ec47 ("Only write '# CONFIG_FOO is not set' for visible symbols")
   mirrors a change I made to the C tools.

 - bbe3ae9 ("Do not write the defconfig_list symbol to .config") mirrors
   another change made to the C tools.

 - Misc. refactoring and cleanup.

2 files changed, 6 insertions, 5 deletions

diff --git a/README.rst b/README.rst
index 207b08c..0b78649 100644
--- a/README.rst
+++ b/README.rst
@@ -178,13 +178,14 @@ installed with e.g.
 
     $ pip(3) install kconfiglib --user
 
-All releases have a corresponding tag in the git repository, e.g. ``v3.2.0``
+All releases have a corresponding tag in the git repository, e.g. ``v4.0.0``
 (the latest version).
 
-`Semantic versioning <http://semver.org/>`_ is used. There's been a
-`tiny change <https://github.com/ulfalizer/Kconfiglib/commit/e8b4ecb6ff6ccc1c7be0818314fbccda2ef2b2ee>`_
+`Semantic versioning <http://semver.org/>`_ is used. There's been
+two small changes (`1 <https://github.com/ulfalizer/Kconfiglib/commit/e8b4ecb6ff6ccc1c7be0818314fbccda2ef2b2ee>_`,
+`2 <https://github.com/ulfalizer/Kconfiglib/commit/db633015a4d7b0ba1e882f665e191f350932b2af>_`)
 to the behavior of the API (which I don't think will affect anyone), which is
-why the major version is at 3 rather than 2.
+why the major version is at 4 rather than 2.
 
 Installation for the Linux kernel
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/setup.py b/setup.py
index a20277a..3a47294 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ import setuptools
 setuptools.setup(
     name="kconfiglib",
     # MAJOR.MINOR.PATCH, per http://semver.org
-    version="3.2.0",
+    version="4.0.0",
     description="A flexible Python Kconfig parser",
     long_description=
         open(os.path.join(os.path.dirname(__file__), "README.rst")).read(),