Tachyon v1.5.0

Changed

• The What's new window shows every release since the version you updated from, newest first, with
  a line saying where the range starts. Updating from 1.3.0 to 1.5.0 used to show only the 1.5.0
  notes; it now shows 1.4.0, 1.4.1, 1.4.2 and 1.5.0. A fresh install, an unreadable record, or
  opening it from the command palette still shows the current release only.

Added

• .json, .jsonc and .json5 files now have syntax colour (strings, numbers, true/false/
  null, and // and /* */ comments), in the same theme colours as fenced code in Markdown (#113).
  The file still opens as plain text and edits as before: colour is computed for the part on screen
  as it is drawn, never for the whole file. Files over 5 MB stay uncoloured, so the large-file path
  is unchanged. Other plain-text files (logs, TOML, YAML and so on) are not coloured.