Bump mockito-core from 3.0.0 to 3.1.0

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.0.0...v3.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

build.gradle

@@ -71,7 +71,7 @@ dependencies {
     testCompile group: 'junit', name: 'junit', version: '4.12'
     testCompile group: 'com.github.stefanbirkner', name: 'system-rules', version: '1.19.0'
     testCompile group: 'org.assertj', name: 'assertj-core', version: '3.14.0'
-    testCompile group: 'org.mockito', name: 'mockito-core', version: '3.0.0'
+    testCompile group: 'org.mockito', name: 'mockito-core', version: '3.1.0'
     testCompile group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.0'
     testCompile group: 'org.jsoup', name: 'jsoup', version: '1.12.1'
     testCompile group: 'cd.go.plugin', name: 'go-plugin-api', version: '18.6.0'