TypeScript v3.1 and v3.2 is no longer officially supported
Node.js v6 is no longer supported
Rule.supports can now return a string respresenting the reason for not supporting the file
Linter#lintAndFix now requires a ProgramFactory instead of Program
Linter#lintAndFix UpdateFileCallback is now expected to only return a SourceFile
no-inferred-empty-object was renamed to no-uninferred-type-parameter

Features:

rules now debuglog the reason for not supporting a certain file
performance improvements
- when linting with --project --references
  - parsed tsconfig.json files are cached for all project references
- when linting with --project --fix
  - the project's dependency graph is recalculated lazily the next time a typed rule reuqests type information after fixing a file
  - module resolutions are cached between fixes
no-uninferred-type-parameter properly handles new default constraint unknown
no-uninferred-type-parameter now detects uninferred type parameters in JS code falling back to any
no-uninferred-type-parameter correctly handles higher order function types
no-useless-initializer checks array destructuring
better handling of computed property names
better handling of object and array destructuring assignments