update version info

Author: ROBOTIS-Will

python/setup.py

@@ -4,7 +4,7 @@
 
 setup(
     name='dynamixel_sdk',
-    version='3.7.21',
+    version='3.7.3',
     packages=['dynamixel_sdk'],
     package_dir={'': 'src'},
     license='Apache 2.0',

ros/CHANGELOG.rst

@@ -5,7 +5,8 @@ Changelog for package dynamixel_sdk
 3.7.3 (2020-07-13)
 -------------------
 * ROS 1 Noetic Ninjemys support
-* Contributors: Will Son
+* 3x faster getError member function of GroupSyncRead Class
+* Contributors: developer0hye, Zerom, Will Son
 
 3.7.21 (2019-09-06)
 -------------------