Adding guava supplement

P/Sda1/Streams/Solution/pom.xml

@@ -34,6 +34,12 @@
                         <scope>test</scope>
                 </dependency>
 
+                <dependency>
+                        <groupId>com.github.npathai</groupId>
+                        <artifactId>hamcrest-optional</artifactId>
+                        <version>2.0.0</version>
+                </dependency>
+
                 <dependency>
                         <groupId>com.google.guava</groupId>
                         <artifactId>guava</artifactId>