Log Message:
gopls: update to 0.6.1.

0.6.1

This is a patch release to fix golang/go#43234. The titles of some
suggested fixes were blank, leading to a bad user experience.

0.6.0

Features
- Default to -mod=readonly
- Default to GOPROXY=off
- Inclusion/exclusion filters for directories
- Debouncing for diagnostics
- "Upgrade direct dependencies" code lens
- Support for filling a partially-populated struct
- Experimental: Field alignment analyzer

Fixes
- Improvements to diagnostics tracking
- File watching for directories

Other
- "codelens" setting name changed to "codelenses"
- Disabled support for symlinks