Fennel 0.3.0 / 2019-09-22

This release introduces docstrings as well as several new features to
the macro system and some breaking changes; the most significant being
the new unquote syntax and the requirement of auto-gensym for
identifiers in backtick.

• Fix a bug where errors would show incorrect line numbers
• Add support for docstrings and doc for displaying them in repl
• Support :detect-cycles? false in fennelview to turn off "#<table 1>" output
• Disallow non-gensym identifiers in backtick/macros
• Support x# syntax for auto-gensym inside backtick
• Fix a bug in lambda arity checks when using destructuring
• Support :one-line output in fennelview
• Add include special form to selectively inline modules in compiled output
• Add --require-as-include to inline required modules in compiled output
• Add --eval argument to command-line launcher
• Add environment variable FENNEL_PATH to path
• Fix a few bugs in match
• Remove undocumented support for single-quoted strings
• Add support for guard clauses with ? in pattern matching
• Support completion in repl when readline.lua is available
• Add --globals and --globals-only options to launcher script
• Remove luaexpr and luastatement for a single lua special
• Improve code generation for if expressions in many situations
• Alias # special with length
• Replace @ (unquote) with ,; comma is no longer whitespace
• Disallow ~ in symbols other than ~=
• Add hashfn and # reader macro for shorthand functions like #(+ $1 $2)
• Allow hashfn arguments to be used in multisyms
• Add macro to make defining a single macro easier
• Add (comment) special which emits a Lua comment in the generated source
• Allow lua-style method calls like (foo:bar baz); disallow : in symbols