Fix release notes typo

Author: aherbert

RELEASE-NOTES.txt

@@ -7,7 +7,7 @@ The Apache Commons RNG project provides pure-Java implementation of pseudo-rando
 
 New features, updates and bug fixes (requires Java 8).
 
-Apache Commons RNG 1.6 contains the following library modules:
+Apache Commons RNG 1.7 contains the following library modules:
  commons-rng-client-api (requires Java 8)
  commons-rng-core (requires Java 8)
  commons-rng-simple (requires Java 8)

src/site/resources/release-notes/RELEASE-NOTES-1.7.txt

@@ -7,7 +7,7 @@ The Apache Commons RNG project provides pure-Java implementation of pseudo-rando
 
 New features, updates and bug fixes (requires Java 8).
 
-Apache Commons RNG 1.6 contains the following library modules:
+Apache Commons RNG 1.7 contains the following library modules:
  commons-rng-client-api (requires Java 8)
  commons-rng-core (requires Java 8)
  commons-rng-simple (requires Java 8)