wip: fix execution of tests via gradle (#26)

Author: astansler

build.gradle

@@ -9,7 +9,7 @@ buildscript {
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.1"
-        classpath "org.junit.platform:junit-platform-gradle-plugin:1.0.0-M4"
+        classpath "org.junit.platform:junit-platform-gradle-plugin:1.0.0-RC2"
     }
 }
 
@@ -65,9 +65,9 @@ dependencies {
             version: '4.8.0.201706111038-r'
 
     testCompile 'org.jetbrains.kotlin:kotlin-test'
-    testCompile 'org.jetbrains.spek:spek-api:1.1.2'
-    testCompile 'org.junit.platform:junit-platform-runner:1.0.0-M4'
-    testRuntime 'org.jetbrains.spek:spek-junit-platform-engine:1.1.2'
+    testCompile 'org.jetbrains.spek:spek-api:1.1.4'
+    testCompile 'org.junit.platform:junit-platform-runner:1.0.0-RC2'
+    testRuntime 'org.jetbrains.spek:spek-junit-platform-engine:1.1.4'
 }
 
 protobuf {