v0.15

New features

• The fvextra package is now required. This provides line breaking with
  fine-grained control over break locations, the ability to highlight
  specific lines or ranges of lines, improved handling of tabs, and several
  additional features.
• Added sub commands and environments (\pys, pysub, ...). These
  commands and environments perform string interpolation on text. Fields
  delimited by !{...} are replaced by the result of evaluating and then
  printing their content. This works for all families of commands and
  environments, not just Python. See the documentation for details about
  field delimiters and escaping.
• Added rust and rs families of commands and environments. These
  provide essentially complete support for Rust, except that
  rstex.formatter(), rstex.before(), and rstex.after() will
  likely need additional refinement (#90).
• Added the sage family of commands and environments, which provide
  support for Sage (#63).
• Added bash family of commands and environments. This provides basic
  support for bash (no utilities class or equivalent). Bash works with
  Windows if it is installed.
• Improved console compatibility under Linux with Python 3 (#70).
• Counters for default sessions are now created automatically. This prevents
  counter errors under some circumstances when working with \includeonly.
• Commands like \py can now output verbatim content under LuaTeX.

Bugfixes

• Fixed a bug that could cause an endless loop when a code command or
  environment printed a code command or environment of the same family
  with autoprint=true.