Bump junit-jupiter-engine from 5.4.0 to 5.6.0 (#86)

* Bump junit-jupiter-engine from 5.4.0 to 5.6.0

Bumps [junit-jupiter-engine](https://github.com/junit-team/junit5) from 5.4.0 to 5.6.0.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit5@r5.4.0...r5.6.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Update build.gradle

Co-authored-by: Sergei Egorov <bsideup@gmail.com>

junit-platform/build.gradle

@@ -27,8 +27,8 @@ dependencies {
     testCompile 'org.assertj:assertj-core:3.11.1'
     testCompile 'io.projectreactor:reactor-core:3.2.2.RELEASE'
 
-    testCompile 'org.junit.jupiter:junit-jupiter-api:5.4.0'
-    testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.4.0'
+    testCompile 'org.junit.jupiter:junit-jupiter-api:5.6.0'
+    testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
 
     // FIXME remove once https://github.com/gradle/gradle/issues/8806 is fixed
     testRuntime 'org.junit.platform:junit-platform-launcher:1.0.0'
@@ -60,4 +60,4 @@ publishing {
             artifactId 'blockhound-junit-platform'
         }
     }
-}
+}