Added >com.github.stefanbirkner dependency (#228).

pom.xml

@@ -46,6 +46,7 @@
 		<junit.version>4.12</junit.version>
 		<mockito.version>2.19.0</mockito.version>
 		<hamcrest.version>1.3</hamcrest.version>
+		<systemRules.version>1.18.0</systemRules.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	</properties>
@@ -258,6 +259,12 @@
 			<version>${hamcrest.version}</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.github.stefanbirkner</groupId>
+			<artifactId>system-rules</artifactId>
+			<version>${systemRules.version}</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 </project>