[ANN] lyaml 6.2.1 released

lyaml's home page is at http://github.com/gvvaughan/lyaml


## Noteworthy changes in release 6.2.1 (2018年02月20日) [stable]    
                                                                
### Bug fixes                                                   
                                                                
  - `spec/spec_helper.lua` now looks in the correct objdir      
    for object modules built by luke, instead of adding unused  
    paths from old Autotools objdirs.  So now specl is properly 
    running examples against the not yet installed lyaml objects.


Install it with LuaRocks, using:

    luarocks install lyaml 6.2.1