[ML] Bumped version to 6.7.0 (#348)

Author: droberts195

doxygen/cplusplus.Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = "Ml C++"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 6.6
+PROJECT_NUMBER         = 6.7
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

gradle.properties

@@ -1,5 +1,5 @@
 org.gradle.daemon=false
 
-elasticsearchVersion=6.6.0
+elasticsearchVersion=6.7.0
 
 artifactName=ml-cpp