mruby 3.4.0 released

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mruby 3.4.0We are announcing the first stable release of mruby 3.4 series - mruby 3.4.0.Describes the new features and changes in mruby 3.4.The main changes in mruby 3.4 are also described in doc/mruby3.4.md.User visible changes in mruby3.4 from mruby3.3“NOTE:” are changes to be aware of.The languagemruby now supports private and protected visibitily (b0db0bd)Maximum length of inlined symbols reduced from 5 to 4 characters to provide space for visibility flags (6442a01)Many methods are made private according to CRuby visibility (4a0e806)Generate OP_SSEND for self.method type calls (111fe4b)initialize method will be always private (eb8b412)Add new hooks method_removed, method_undefined (9c74f6e)Add new hooks singleton_method_removed, singleton_method_undefined (0863c08)Updated OP_DEF output from codedump (3a3e877)Better handling of binary strings, e.g. String#b (b0127f0)Hash to_s format has changed (baeeb5e)Some encoding related method such as #force_encoding (e47b4ca), #b (b0127f0)C…