Add release notes for libgpiod v0.3.1.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
+libgpiod v0.3.1
+===============
+
+Bug fixes:
+- fix checking the kernel version in the test suite
+
+Improvements:
+- re-enable a test case previously broken by a bug in the kernel
+
+This is the first version hosted at kernel.org. README.md has been renamed to
+README as the .md file was not being packaged automatically by autotools,
+which went unnoticed due to not using 'make dist' until now.
+
libgpiod v0.3
=============