fixed junit

pom.xml

@@ -15,6 +15,13 @@
   </properties>
 
   <dependencies>
+      
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
     
     <dependency>
     	<groupId>org.openjfx</groupId>
@@ -79,7 +86,7 @@
             <artifactId>maven-compiler-plugin</artifactId> 
             <version>3.8.0</version> 
             <configuration> 
-                <release>11</release> 
+                <release>10</release> 
                 <showWarnings>true</showWarnings> 
                 <showDeprecation>true</showDeprecation> 
             </configuration>