Merge pull request #2882 from codler/patch-4

Fix typo

README.md

@@ -38,7 +38,7 @@ submitter will be asked to start a discussion (if they haven't already) on the
 
 The patch will be accepted if there is broad consensus that it is a good thing.
 Developers should expect to rework and resubmit patches if the code doesn't
-match the project's coding conventions (see `doc/coding.txt`) or are
+match the project's coding conventions (see `doc/coding.md`) or are
 controversial.
 
 The `master` branch is regularly built and tested, but is not guaranteed to be