0.13.0

• (breaking change) Matrix was moved to a separate shard: https://github.com/Exilor/matrix
• The syntax of a method argument with a default value and a type restriction is now def foo(arg : Type = default_value). Run crystal tool format to automatically upgrade exsiting code to this new syntax. The old def foo(arg = default_value : Type) syntax will be removed in a next release.
• Special handling of case with a tuple literal. See #2258.
• Keywords can now be used for variable declaration, so property end : Time works as expected.
• Comparison of signed vs. unsigned integers now always give a correct result
• Allow declaring instance variables in non-generic module types (module Moo; @x : Int32; end)
• Allow initializing instance variables in non-generic module types (module Moo; @x = 1; end)
• Spec: allow setting multiple output formatters (thanks @marceloboeira)
• StringScanner: improved performance
• Added foo.[0] = 1 and foo.[0] as valid syntax, similar to the one in &. blocks (thanks @makenowjust)
• CSV: allow separate and quote characters different than comma and doble quote (thanks @jreinert)
• YAML: support merge operator (<<) (thanks @jreinert)
• Allow redefining primitive methods like Int32#+(other : Int32)
• Allow defining macros with operator names like []
• Levenshtein: improved performance (thanks @tcrouch)
• HTTP::Client: fixed incorrect parsing of chunked body
• HTTP::Client: added a constructor with an URI argument (thanks @plukevdh)
• String: sub and gsub now understand backreferences (thanks @bjmllr)
• Random: added Random#rand(Float64) and Random#rand(Range(Float, Float)) (thanks @AlexWayfer)
• HTML: HTLM.escape includes more characters (thanks @Ryuuzakis)
• Added TypeNode.class method in macros (thanks @waterlink)
• run inside macros now also work with absolute paths (useful when used with __DIR__)
• Added docs for Math and StaticArray (thanks @zavydiel, @HeleneMyr)
• Many bug fixes and some micro-optimizations