Use cryptogrphic Blake2b hash as determisitic fold random source

The original standard hash code function was in effect partially
dependent on the order of the texts.
diff --git a/pom.xml b/pom.xml
index 54b31bf..beda604 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>groupId</groupId>
     <artifactId>nGrammFoldCount</artifactId>
-    <version>1.3</version>
+    <version>1.5</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -162,5 +162,10 @@
             <version>RELEASE</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.bouncycastle</groupId>
+            <artifactId>bcprov-jdk15on</artifactId>
+            <version>1.66</version>
+        </dependency>
     </dependencies>
 </project>
\ No newline at end of file