prepare release 0.4.9

ROBOTIS-Will · ROBOTIS-Will · commit 39d02546af34 · 2021-08-12T09:57:42.000+09:00
Signed-off-by: Will Son &lt;willson@robotis.com&gt;
diff --git a/library.properties b/library.properties
@@ -1,5 +1,5 @@
 name=Dynamixel2Arduino
-version=0.4.8
+version=0.4.9
 author=ROBOTIS
 license=Apache-2.0
 maintainer=Will Son(willson@robotis.com)
