Update Changelog.md

Author: bsb808

Changelog.md

@@ -106,7 +106,7 @@ This changelog covers the entire dave project which includes a few repositories,
 
 ### Added
 
-- Object model degredation tool.  
+- Object model degradation tool.  
     - 3D mesh modification via Blender script [PR#160](https://github.com/Field-Robotics-Lab/dave/pull/160)
     - Parameterization proof of concept for SDF friction values via embedded Ruby scropt [PR#163](https://github.com/Field-Robotics-Lab/dave/pull/163)
     - Demonstration of addition of custome SDF tags for extending model properties and corresponding influence on sensing [PR#164](https://github.com/Field-Robotics-Lab/dave/pull/164)