Add default JUnit engine and let the compilers do the directory stuff themselves.

Author: GiantTreeLP

pom.xml

@@ -83,8 +83,6 @@
     </distributionManagement>
 
     <build>
-        <sourceDirectory>src/main/kotlin</sourceDirectory>
-        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
         <plugins>
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
@@ -234,6 +232,11 @@
                         <artifactId>junit-jupiter-engine</artifactId>
                         <version>5.0.0-M3</version>
                     </dependency>
+                    <dependency>
+                        <groupId>org.junit.vintage</groupId>
+                        <artifactId>junit-vintage-engine</artifactId>
+                        <version>4.12.0-M3</version>
+                    </dependency>
                 </dependencies>
             </plugin>
         </plugins>