upgrade JUnit dependencies #292

* JUnit 4 `[4.12 -> 4.13]`
* JUnit Platform `[1.5.1 -> 1.5.2]`
* JUnit Jupiter/Vintage `[5.5.1 -> 5.5.2]`

Author: codecholeric

build.gradle

@@ -39,13 +39,13 @@ ext {
             log4j_core          : 'org.apache.logging.log4j:log4j-core:2.11.1',
             log4j_slf4j         : 'org.apache.logging.log4j:log4j-slf4j-impl:2.11.1',
 
-            junit4              : 'junit:junit:4.12',
-            junit5VintageEngine : 'org.junit.vintage:junit-vintage-engine:5.5.1',
-            junit5JupiterApi    : 'org.junit.jupiter:junit-jupiter-api:5.5.1',
-            junit5JupiterEngine : 'org.junit.jupiter:junit-jupiter-engine:5.5.1',
-            junitPlatform       : 'org.junit.platform:junit-platform-runner:1.5.1',
-            junitPlatformCommons: 'org.junit.platform:junit-platform-commons:1.5.1',
-            junitPlatformEngine : 'org.junit.platform:junit-platform-engine:1.5.1',
+            junit4              : 'junit:junit:4.13',
+            junit5VintageEngine : 'org.junit.vintage:junit-vintage-engine:5.5.2',
+            junit5JupiterApi    : 'org.junit.jupiter:junit-jupiter-api:5.5.2',
+            junit5JupiterEngine : 'org.junit.jupiter:junit-jupiter-engine:5.5.2',
+            junitPlatform       : 'org.junit.platform:junit-platform-runner:1.5.2',
+            junitPlatformCommons: 'org.junit.platform:junit-platform-commons:1.5.2',
+            junitPlatformEngine : 'org.junit.platform:junit-platform-engine:1.5.2',
             hamcrest            : 'org.hamcrest:hamcrest-core:1.3',
             junit_dataprovider  : 'com.tngtech.java:junit-dataprovider:1.11.0',
             mockito             : 'org.mockito:mockito-core:2.27.0',