0.20.3

• (breaking change) IO#gets, IO#each_line, String#lines, String#each_line, etc. now chomp lines by default. You can pass chomp: false to prevent automatic chomping. Note that chomp is true by default for argless IO#gets (read line) but false if args are given.
• (breaking change) HTTP::Handler is now a module instead of a class (thanks @andrewhamon)
• (breaking change) Free variables now must be specified with forall, a single uppercase letter will not work anymore
• (breaking change) The libs directory is no longer in the default CRYSTAL_PATH, use lib (running crystal deps should fix this)
• Optimized compile times, specially on linux
• private can now be used with macros inside types (thanks @makenowjust)
• CLI: the -s/--stats option now also shows execution time (thanks @makenowjust)
• CLI: added -t/--time to show execution time (thanks @makenowjust)
• Socket now allows any family/type/protocol association, and many other improvements (thanks @ysbaddaden)
• YAML: an IO can now be passed to from_yaml (thanks @makenowjust)
• Added class_getter, class_setter, class_property, etc. (thanks @Sija)
• Added String#lchomp (thanks @Sija)
• Added IO#read_fully?
• Added Iterator#flatten (thanks @makenowjust)
• Added HTTP::WebSocket#ping, pong, on_ping, on_pong, and now a ping message is automatically replied with a pong message (thanks @Sija)
• Added File#empty? and Dir#empty? (thanks @dylandrop)
• Added Time::Span#/(Time::Span) (thanks @RX14)
• Added String#split versions that accept a block (thanks @splattael)
• Added URI#normalize and normalize! (thanks @taylorfinnell)
• Added reuse optional argument to many Array, Enumerable and Iterable methods that allow you to reuse the yielded/return array for better performance and less memory footprint
• The :debug flag is now present when compiled with --debug, useful for doing flag?(:debug) in macros (thanks @luislavena)
• Many bug fixes and performance improvements