News in 4.5.91, 2020-02-14
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* GObject Introspection fixes
* Removed use of g_assert() in favor of alternatives in unit tests so
  distribution unit testing is more reliable
* Robustness improvements in internal GtkTextIter movements
* Style scheme improvements for recent GTK 3 theme styling changes
* Build system improvements to support -Bsymbolic, -Wl,-z,relro,
  -Wl,-z,now and -Wl,-z,defs
* Build improvements for Windows, FreeBSD, and macOS
* cmake.lang: track CMake 3.13 changes
* kotlin.lang: register *.kts glob extension
* gradle.lang: register *.grandle glob extension
* php.lang: Large redesigned PHP lang including support for
  unicode and improved heredoc
* sh.lang: Many improvements including various GNU bash extensions
* meson.lang: Support for string escape sequences
* javascript.lang: Redesign of JavaScript language spec to be more flexible
  and reusable from other languages which support JS.
* jsx.lang: Initial support for JSX
* jsdoc.lang: Initial support for JSDoc
* objj.lang: Improvements using javascript improvements
* asciidoc.lang: Improvements to use more generic markup styling
* t2t.lang: Improvements to use more generic markup styling
* css.lang: Redesign to be more flexible, support reuse and embedding, and
  add various new CSS features
* scss.lang: Improve integration with css.lang
* less.lang: Improve integration with css.lang
* ruby.lang: Improvements for string and escape string handling
* html.lang: Improvements using embedded languages
* go.lang: Improvements for escape sequences
* commonlisp.lang: Initial support for Common Lisp
* ftl.lang: Initial support for Mozilla's Fluent ftl
* Translation updates

I'd like to personally thank Jeffery To for the overwhelming amount of work
they have put into reviewing and improving both language specs and style
schemes this cycle. The number of improvements you see above are largely an
example of their quality reviews and improvements!