=> 0.4.2

Features:
* Symbol highlighting (@rwols)
* Polymer language server configuration (@rictic)
* Support RustEnhanced syntax

Major bug fixes:
* JSON-RPC & protocol parsing fixes (@vogelsgesang)
* Prevent completion failure if sortText was None.

See https://github.com/tomv564/LSP/releases/tag/0.4.2 for full update details.
