upgrade the Acorus library to v2.0.0

Author: stephengold

common.gradle

@@ -8,7 +8,7 @@ ext {
     websiteUrl = 'https://github.com/stephengold/jme3-utilities'
 
     // module coordinates of external dependencies:
-    acorusCoordinates = 'com.github.stephengold:Acorus:1.1.1'
+    acorusCoordinates = 'com.github.stephengold:Acorus:2.0.0'
     heartCoordinates = 'com.github.stephengold:Heart:9.0.0'
 
     // current versions of libraries: