Bump mockito-core from 2.28.1 to 2.28.2 (#131)

Bumps [mockito-core](https://github.com/mockito/mockito) from 2.28.1 to 2.28.2.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v2.28.1...v2.28.2)

pom.xml

@@ -86,7 +86,7 @@
 
         <junit.version>4.12</junit.version>
         <hamcrest.version>2.1</hamcrest.version>
-        <mockito.version>2.28.1</mockito.version>
+        <mockito.version>2.28.2</mockito.version>
         <slf4j.version>1.7.26</slf4j.version>
         <logback.version>1.2.3</logback.version>
         <jsonassert.version>1.5.0</jsonassert.version>