Fix: add fixtures.h to makefile.am as EXTRA_DIST

Signed-off-by: David Goulet <dgoulet@ev0ke.net>
Fix: add fixtures directory to EXTRA_DIST

Signed-off-by: David Goulet <dgoulet@ev0ke.net>
Update version to v2.0.0-rc3

Signed-off-by: David Goulet <dgoulet@ev0ke.net>