v2.4.0

Highlights:

• Publish as a JS package, mvdan-sh
• syntax
  • Add DebugPrint to pretty-print a syntax tree
  • Fix comment parsing and printing in some edge cases
  • Indent <<- heredoc bodies if indenting with tabs
  • Add support for nested backquotes
  • Relax parser to allow quotes in arithmetic expressions
  • Don't rewrite declare foo= into declare foo
• interp
  • Add support for shopt -s globstar
  • Replace Runner.Env with an interface
• shell
  • Add Expand as a fully featured version of os.Expand
• cmd/shfmt
  • Set appropriate exit status when -d is used

Binaries built on go version go1.10.2 linux/amd64.