Fix project config file discovery

Flake8 3.0 was stopping once it found the current directory but the
historical behaviour (that we didn't intend to break) searched past
that (towards root) until it found one of the project/local config
file names that could be read.

Closes #181

docs/source/release-notes/3.0.1.rst

@@ -1,5 +1,5 @@
-3.0.1 -- 2016-07-25
--------------------
+3.0.1 -- 2016-07-25 (unreleased)
+--------------------------------
 
 - Fix regression in handling of ``# noqa`` for multiline strings.
   (See also `GitLab#177`_)

docs/source/release-notes/3.0.2.rst

@@ -0,0 +1,9 @@
+3.0.2 -- 2016-07-26
+-------------------
+
+- Fix local config file discovery.  (See also `GitLab#181`_)
+
+
+.. links
+.. _GitLab#181:
+    https://gitlab.com/pycqa/flake8/issues/181

docs/source/release-notes/index.rst

@@ -6,6 +6,7 @@ All of the release notes that have been recorded for Flake8 are organized here
 with the newest releases first.
 
 .. toctree::
+    3.0.2
     3.0.1
     3.0.0
     2.6.2