release 6.4.0

IPython/core/release.py

@@ -24,7 +24,7 b' _version_minor = 4'
 _version_patch = 0
 _version_extra = '.dev'
 # _version_extra = 'rc2'
-# _version_extra = ''  # Uncomment this for full releases
+_version_extra = ''  # Uncomment this for full releases
 
 # Construct full version string from these.
 _ver = [_version_major, _version_minor, _version_patch]

docs/source/whatsnew/index.rst

@@ -20,7 +20,6 b' development work they do here in a user friendly format.'
 .. toctree::
    :maxdepth: 1
 
-   development
    version6
    github-stats-6
    version5