[skip ci] Update doc api conf to 2.2.0

Author: jcheron

.codedocs

@@ -38,7 +38,7 @@ PROJECT_NAME           = Ubiquity
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 2.1.4
+PROJECT_NUMBER         = 2.2.0
 
 # 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