MIME4J-289 Upgrade mockito 1.9.5 -> 3.0.0

pom.xml

@@ -72,7 +72,7 @@
         <commons-logging.version>1.2</commons-logging.version>
         <log4j.version>1.2.17</log4j.version>
         <junit.version>4.12</junit.version>
-        <mockito.version>1.9.5</mockito.version>
+        <mockito.version>3.0.0</mockito.version>
         <commons-io.version>2.6</commons-io.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>