Bump assertj-core from 3.12.0 to 3.12.2

Bumps [assertj-core](https://github.com/joel-costigliola/assertj-core) from 3.12.0 to 3.12.2.
- [Release notes](https://github.com/joel-costigliola/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.12.0...assertj-core-3.12.2)

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

Author: dependabot-support

build.gradle

@@ -64,7 +64,7 @@ configure(javaprojects) {
             dependency 'javax.servlet:javax.servlet-api:3.1.0'
 
             dependency 'junit:junit:4.12'
-            dependency 'org.assertj:assertj-core:3.12.0'
+            dependency 'org.assertj:assertj-core:3.12.2'
             dependency 'org.mockito:mockito-core:2.24.5'
             dependency 'org.powermock:powermock-api-mockito2:2.0.0'
             dependency 'org.powermock:powermock-module-junit4:2.0.0'