Make 2.6.0 releasev2.6.0

This release tightens up syntax checking and adds all the warnings
generated by the C implementation (plus a few extra ones), making
Kconfiglib more viable as a replacement for the C tools, rather than
just being an auxiliary library.

Syntax checking changes:

 - a84848b ("Tighten up syntax checking")
 - 8716316 ("Generate a parse error for extra tokens at EOL")
 - 416083a ("Flag constant symbols where they're not allowed")

Warning changes:

 - 9c309400 ("Add some post-parsing warnings")
 - da0bfa3a ("Error out for malformed hex/int/string defaults")
 - 5d2041a9 ("Add more choice type and prompt sanity checks")
 - 67f825fc ("Warn if there's more than one help text")
 - 990c780f ("Add some warnings related to selects and implies")
 - 7432ade8 ("Warn if a symbol is defined with multiple types")
 - 5eeea863 ("Improve int/hex sanity checking")
 - ad94bb45 ("Sanity-check range values")
 - e930c140 ("Warn if a symbol/choice has multiple prompts")
 - 60d12911 ("Warn if help text is empty")
 - d43d2e83 ("Warn if menuconfig statement has no prompt")
 - 3db12f72 ("Warn if a choice symbol has defaults")
 - 0eadd61c ("Warn if choice symbol has prompt outside choice")

Also includes various code nits.

2 files changed, 14 insertions, 3 deletions

diff --git a/README.rst b/README.rst
index d69ded1..13385fb 100644
--- a/README.rst
+++ b/README.rst
@@ -105,7 +105,18 @@ Here are some other features:
   Kconfiglib also works well with the
   `multiprocessing <https://docs.python.org/3/library/multiprocessing.html>`_
   module. No global state is kept.
-  
+
+- **Warning parity with the C implementation**
+
+  Generates the same warnings as the C implementation, plus a few extra ones.
+
+  This is less important if the input is assumed to be well-formed, but makes
+  Kconfiglib a viable replacement for the C tools if e.g. a ``menuconfig``
+  interface is added.
+
+  All warnings point out the location(s) in the ``Kconfig`` files where a
+  symbol is defined, where applicable.
+
 - **Windows support**
 
   Nothing Linux-specific is used. Universal newlines mode is used for both
@@ -157,7 +168,7 @@ installed with e.g.
 
     $ pip(3) install kconfiglib --user
 
-All releases have a corresponding tag in the git repository, e.g. ``v2.5.0``.
+All releases have a corresponding tag in the git repository, e.g. ``v2.6.0``.
 `Semantic versioning <http://semver.org/>`_ is used.
 
 Installation for the Linux kernel
diff --git a/setup.py b/setup.py
index cb6847d..47adc2b 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="2.5.0",
+    version="2.6.0",
     description="A flexible Python Kconfig parser",
     long_description=
         open(os.path.join(os.path.dirname(__file__), "README.rst")).read(),