setup.cfg: Restructure file

Place configuration of the package itself first in the file, followed by
configuration of other tools.

Signed-off-by: Stephen Finucane <stephen@that.guru>

setup.cfg

@@ -1,11 +1,20 @@
+[metadata]
+license_file = LICENSE
+
 [egg_info]
 tag_build = .dev
 tag_date = true
 
+[bdist_wheel]
+universal = 1
+
 [aliases]
 release = egg_info -Db ''
 upload = upload --sign --identity=36580288
 
+[build_sphinx]
+warning-is-error = 1
+
 [extract_messages]
 mapping_file = babel.cfg
 output_file = sphinx/locale/sphinx.pot
@@ -20,12 +29,6 @@ output_dir = sphinx/locale/
 domain = sphinx
 directory = sphinx/locale/
 
-[bdist_wheel]
-universal = 1
-
-[metadata]
-license_file = LICENSE
-
 [flake8]
 max-line-length = 95
 ignore = E116,E241,E251,E741
@@ -40,6 +43,3 @@ follow_imports = skip
 incremental = True
 check_untyped_defs = True
 warn_unused_ignores = True
-
-[build_sphinx]
-warning-is-error = 1