fix gradle build by adding missing deps

build.gradle

@@ -3,8 +3,8 @@ subprojects {
     apply plugin: 'application'
 
     dependencies {
-        compile 'net.i2p:i2p:0.9.35'
-        compile 'org.codehaus.groovy:groovy-all:2.5.0'
+        compile 'net.i2p:i2p:0.9.40'
+        compile 'org.codehaus.groovy:groovy-all:2.5.7'
     }
 
     compileGroovy {

core/build.gradle

@@ -1,6 +1,9 @@
 mainClassName = 'com.muwire.core.Core'
 
 dependencies {
-    compile 'net.i2p.client:mstreaming:0.9.35'
-    compile 'net.i2p.client:streaming:0.9.35'
+    compile 'net.i2p.client:mstreaming:0.9.40'
+    compile 'net.i2p.client:streaming:0.9.40'
+
+    testCompile 'org.junit.jupiter:junit-jupiter-api:5.4.2'    
+    testCompile 'junit:junit:4.12'
 }