Document how to run coverage.

diff --git a/README.mkd b/README.mkd
index f2c0874..d374c35 100644 (file)
--- a/README.mkd
+++ b/README.mkd
@@ -92,6 +92,11 @@ The library includes a test suite that uses the `check` C unit test library.
 
     $ make test
 
+You can also see the test coverage if you have `lcov` installed and the
+`BROWSER` environment variable set to your choice of web browsers:
+
+    $ BROWSER=google-chrome-stable make coverage
+
 ## Authors
 
 Chris Peplin cpeplin@ford.com

diff --git a/deps/bitfield-c b/deps/bitfield-c
index 31caa9c..09dc97c 160000 (submodule)
--- a/deps/bitfield-c
+++ b/deps/bitfield-c
@@ -1 +1 @@
-Subproject commit 31caa9c77dbfc438a104fbcab6db5165528c0f89
+Subproject commit 09dc97c24f9f9a9c2638405167bffe339f666e2a