Patch release v0.4.2

- efficiency updates
- docs updates

Author: saxbophone

CMakeLists.txt

@@ -9,7 +9,7 @@ else()
     set(ARBY_SUBPROJECT ON)
 endif()
 
-project(arby VERSION 0.4.1 LANGUAGES CXX)
+project(arby VERSION 0.4.2 LANGUAGES CXX)
 
 find_program(CCACHE_PROGRAM ccache)
 if(CCACHE_PROGRAM)