Changes since last release (https://github.com/github/linguist/compare/v7.15.0...v7.16.0):

• Add .javascript file extension (#5414)
• Add ECL grammar (#5424)
• Move and rename C++ sample (#5427)
• Fix incorrect capitalisation in .properties heuristic (#5434)
• Rename language entry for e-mail files (#5437)
• Improve override examples (#5440)
• Lock docker version and require set (#5453)
• Update Hy language grammar (#5425)
• Add Fennel (#5441)
• Add JSON color (#5449)
• Add ".jav" to list of Java extensions (#5397)
• Small fixes to github-linguist command line tool when used in single file mode. (#5382)
• Improve parser for env command's args in shebang (#5461)
• docs: fix wrong doc link (#5471)
• Update Swift color to match the official Swift logo (#5405)
• Add Pascal heuristic for .inc extension (#5143)
• Add support for Kakoune Script (#5058)
• Add Astro language (#5460)
• Handle full and symlink paths to indiv files (#5473)
• Add filesize metrics to github-linguist output (#5464)
• Separate Cython from Python (#5462)
• update_groovy_color (#5418)
• Add colours to many languages (#5476)
• Replace Boo grammar (#5484)
• Improve SourcePawn heuristics (#5479)

... and an update to the latest version of all grammars.