gopls/v0.4.4

• Support for opening a single file. Previously, gopls required you to open an entire directory.
• Support features and diagnostics for the entire module, even when you open a subdirectory of the module.
• Extract a selected range to a variable or to a function. This feature is still relatively new, so please report issues if you encounter any. (@joshbaum)
• Fillstruct performance improvements. It is now enabled by default again. (@joshbaum)
• Improvements in go.mod diagnostic error presentation.

A full list of all issues closed is available in the gopls/v0.4.4 milestone.