add correct version

Author: sujankota

sdk/src/main/java/io/opentdf/platform/sdk/TDF.java

@@ -36,7 +36,7 @@
  */
 public class TDF {
 
-    private static final String TDF_VERSION = "x.x.x";
+    private static final String TDF_VERSION = "1.0.0";
     private final long maximumSize;
 
     /**