Version 6.4.0

### Bug fixes

Only match Solr operator words when they are upper-case.

Fix an infinite loop when tokenizing heredoc strings in the Crystal mode.

### New features

Add the old Pug mode.

Version 6.3.3

### Bug fixes

In Shell mode, don't allow spaces in heredoc tokens.

Version 6.3.2

### Bug fixes

Fix tokenizing of character literals in the Scala mode.

Version 6.3.1

### Bug fixes

In JavaScript, properly parse keywords like `static` when in front of a private property.

Version 6.3.0

### New features

Add the old PegJS mode.

Version 6.2.0

### Bug fixes

Include type declarations for mode/simple-mode.js.

### New features

Include a name for each mode in the stream parser objects.

Version 6.1.0

### Bug fixes

Add structured concurrency keywords to the Swift mode. Update readme to follow interface changes

### New features

Adds the Sass mode from CodeMirror 5.

Version 6.0.0

### Bug fixes

Add line comment syntax metadata to the Toml mode.

Version 0.20.0

### Breaking changes

Update dependencies to 0.20.0

Version 0.19.1

### Bug fixes

Fix an issue causing the Lua mode to indent everything one unit too far.

Fix a bug in the Swift mode when indenting an empty block after exploding with `insertNewlineAndIndent`.