Define missing dependency version variables

build.gradle

@@ -1,7 +1,3 @@
-if (JavaVersion.current() != JavaVersion.VERSION_1_10) {
-    // feel free to delete this if you know what you are doing
-    throw new GradleException("This build must be run with java 10. See docs/build.md")
-}
 buildscript {
     repositories {
         jcenter()
@@ -49,7 +45,6 @@ configure(subprojects) {
         jcsvVersion = '1.4.0'
         jetbrainsAnnotationsVersion = '13.0'
         jfoenixVersion = '9.0.6'
-        jmockitVersion = '1.42'
         joptVersion = '5.0.3'
         jsonsimpleVersion = '1.1.1'
         junitVersion = '4.12'
@@ -58,9 +53,8 @@ configure(subprojects) {
         langVersion = '3.4'
         logbackVersion = '1.1.10'
         lombokVersion = '1.18.2'
-        mockitoVersion = '2.21.0'
+        mockitoVersion = '3.0.0'
         netlayerVersion = '0.6.5.1'
-        powermockVersion = '2.0.0-beta.5'
         protobufVersion = '3.5.1'
         pushyVersion = '0.13.2'
         qrgenVersion = '1.3'