package.json: change the default format tool to goimports

Module mode is the default since go1.16.
Still left it as an option for users who still work with different
build systems that operate in GOPATH mode.

Fixes #192

Change-Id: I162e30088fe94d4ea47f2d8d17cb2aaad830b9a5
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/300431
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>

Author: hyangah

docs/settings.md

@@ -235,7 +235,7 @@ Flags to pass to format tool (e.g. ["-s"]). Not applicable when using the langua
 Not applicable when using the language server. Choosing 'goimports', 'goreturns', or 'gofumports' will add missing imports and remove unused imports.<br/>
 Allowed Options: `gofmt`, `goimports`, `goreturns`, `goformat`, `gofumpt`, `gofumports`
 
-Default: `"goreturns"`
+Default: `"goimports"`
 ### `go.generateTestsFlags`
 
 Additional command line flags to pass to `gotests` for generating tests.

docs/tools.md

@@ -116,11 +116,11 @@ It can also be used to provide the [go to definition](features.md#go-to-definiti
 
 * [`gogetdoc`], [`godef`], [`godoc`]: these are documentation tools used for the [go to definition](features.md#go-to-definition), [signature help](features.md#signature-help), and [quick info on hover](features.md#quick-info-on-hover) in the legacy mode. [`guru`](#guru) can also be used, but only for the [go to definition](features.md#go-to-definition) behavior. Configure this via the [`"go.docsTool"`](settings.md#go.docsTool) setting.
 
-* [`goreturns`], [`gofmt`], [`goimports`]: Formatting tools are used by the [formatting and import organization](features.md#format-and-organize-imports) features. [`goreturns`] is used by default in the legacy mode. It formats the file according to the industry standard [`gofmt`] style, organizes imports, and fills in default return values for functions. Other tools can be used for formatting instead; this can be configured with the [`"go.go.formatTool"`](settings.md#formatTool) setting. Note that [`goreturns`] does not have support for Go modules.
+* [`goimports`], [`gofmt`]: Formatting tools are used by the [formatting and import organization](features.md#format-and-organize-imports) features. [`goreturns`] is used by default in the legacy mode. It formats the file according to the industry standard [`gofmt`] style, organizes imports, and fills in default return values for functions. Other tools can be used for formatting instead; this can be configured with the [`"go.go.formatTool"`](settings.md#formatTool) setting.
 
-  * [`goimports`], which applies the default `gofmt` style and organizes imports, but without the behavior of filling in default return values
   * [`gofmt`] only formats the file, without import organization or filling in return values
   * [`goformat`] is a configurable version of [`gofmt`]
+  * [`goreturns`] fills in default return values for functions, in addition to applying `goimports`-style formatting. This tool does not have support for Go modules.
 
 * Diagnostics tools: By default, [`gotype-live`], [`go vet`], and [`golint`] are used to provide [build](features.md#build-errors), [vet](features.md#vet-errors), and [lint](features.md#lint-errors) errors. [`gotype-live`] provides build errors as you type, while `go build` can be used to show build errors only on save. [`gotype-live`] does not work with modules.
 

package.json

@@ -1018,7 +1018,7 @@
         },
         "go.formatTool": {
           "type": "string",
-          "default": "goreturns",
+          "default": "goimports",
           "description": "Not applicable when using the language server. Choosing 'goimports', 'goreturns', or 'gofumports' will add missing imports and remove unused imports.",
           "scope": "resource",
           "enum": [