Merge branch 'pr-128'

Author: joschi

pom.xml

@@ -56,7 +56,7 @@
         <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
         <junit.jupiter.version>5.5.2</junit.jupiter.version>
         <junit.platform.version>1.3.2</junit.platform.version>
-        <assertj-core.version>3.14.0</assertj-core.version>
+        <assertj-core.version>3.15.0</assertj-core.version>
     </properties>
 
     <dependencies>