MAINT: Bump -dev version

Author: effigies

nibabel/info.py

@@ -17,10 +17,10 @@
 # We usually use `dev` as `_version_extra` to label this as a development
 # (pre-release) version.
 _version_major = 2
-_version_minor = 3
-_version_micro = 1
-# _version_extra = 'dev'
-_version_extra = ''
+_version_minor = 4
+_version_micro = 0
+_version_extra = 'dev'
+# _version_extra = ''
 
 # Format expected by setup.py and doc/source/conf.py: string of form "X.Y.Z"
 __version__ = "%s.%s.%s%s" % (_version_major,