amend redirecting URLs via "xurls -fix"

CONTRIBUTING.md

@@ -14,7 +14,7 @@ When contributing for the first time, you should also add yourself to the
 ### Testing
 
 Just the usual `go test ./...`; many of the tests are in
-[testscript](https://godoc.org/github.com/rogpeppe/go-internal/testscript) under
+[testscript](https://pkg.go.dev/github.com/rogpeppe/go-internal/testscript) under
 `testdata/script/`, which allows laying out files and shell-like steps to run as
 part of the test.
 

README.md

@@ -28,7 +28,7 @@ order to:
 
 * Replace as many useful identifiers as possible with short base64 hashes
 * Replace package paths with short base64 hashes
-* Remove all [build](https://golang.org/pkg/runtime/#Version) and [module](https://golang.org/pkg/runtime/debug/#ReadBuildInfo) information
+* Remove all [build](https://go.dev/pkg/runtime/#Version) and [module](https://go.dev/pkg/runtime/debug/#ReadBuildInfo) information
 * Strip filenames and shuffle position information
 * Strip debugging information and symbol tables via `-ldflags="-w -s"`
 * [Obfuscate literals](#literal-obfuscation), if the `-literals` flag is given
@@ -42,7 +42,7 @@ module path, to obfuscate all packages under the current module.
 
 Note that commands like `garble build` will use the `go` version found in your
 `$PATH`. To use different versions of Go, you can
-[install them](https://golang.org/doc/manage-install#installing-multiple)
+[install them](https://go.dev/doc/manage-install#installing-multiple)
 and set up `$PATH` with them. For example, for Go 1.17.1:
 
 ```sh

main.go

@@ -1939,7 +1939,7 @@ func fetchGoEnv() error {
 
 This is likely due to go not being installed/setup correctly.
 
-How to install Go: https://golang.org/doc/install
+How to install Go: https://go.dev/doc/install
 `, err)
 		return errJustExit(1)
 	}