Update LICENSE

LICENSE

@@ -28,3 +28,6 @@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------
+Audiocate makes use of the Sndfile and Hsndfile wrapper libraries which are licensed under LGPL-2.1 and therefore is dynamically linked to, with the source code available at https://hackage.haskell.org/package/hsndfile-0.8.0/docs/Sound-File-Sndfile.html and https://github.com/libsndfile/libsndfile