0.22.0

New features and improvements:

• Added detection of cyclomatic complexity, with warnings emitted for
  functions with complexity higher than a configurable limit; disabled
  by default (#141).
• Added a built-in formatter printing warnings and errors in a format
  understood by MSBuild/Visual Studio if luacheck is
  used as a custom build step (#142).
• ranges and quiet options can now be used in config, e.g. quiet = 1 to
  disable OK lines in default formatter output.
• luacheck module now adds prev_line, prev_column, and prev_end_column
  fields to syntax error events if they refer to some extra location:
  redefined label errors point to the previous definition,
  unpaired tokens such as function/end point to the the first token (#134).
• luacheck module now adds prev_end_column field to warning events that
  already have prev_line and prev_column fields, and overwritten_end_column
  for warnings with overwritten_line and overwritten_column.
• Improved error messages for invalid options and config: when an option is
  invalid, extra context is provided instead of just the name.
• Custom stds are now validated on config load.
• When recursively checking a directory, each failure to list a nested
  directory is now reported separately, and other found files and directories
  are checked anyway. Previously any error when listing any nested directory
  resulted in immediate failure for the entire parent directory (#159).
• When --[no-]cache CLI option is used with LuaFileSystem not found,
  it is now ignored instead of causing an error. Missing LuaFileSystem is now
  mentioned in the help message next to features disabled without it.

Fixes:

• Fixed errors or incorrect reporting when unused mutually recursive functions
  have other values assigned to their local variables.
• Fixed unused values in infinite loops sometimes reported
  as overwritten by another value.
• Fixed caching not working properly when cache is enabled in config
  loaded from a parent directory.
• Fixed per-path config overrides not working on Windows when paths in config
  and input paths use different case (#150).
• Added missing definition of love.handlers to love std (#161).

Miscellaneous:

• Installer script (install.lua) is deprecated. Future versions of Luacheck
  may have required dependencies. Luacheck can still be installed manually
  by recursively copying src/luacheck to a directory in package.path
  and copying bin/luacheck.lua to a directory in PATH as luacheck.