Bump module path to v2 for breaking Stage interface change

The Stage interface in this series is not backwards compatible:

- Start()'s signature changed from:

    Start(ctx, env, stdin io.ReadCloser) (io.ReadCloser, error)

  to:

    Start(ctx, env, stdin io.ReadCloser, stdout io.WriteCloser) error

- Stage gained a new required method Preferences().

Callers that only construct stages via the package's exported
constructors (Command(), CommandStage(), Function(), ...) are
unaffected, but anyone implementing Stage themselves has to update their
implementation.

Author: znull

README.md

@@ -1,9 +1,9 @@
-# go-pipe [![GoDoc](https://pkg.go.dev/badge/github.com/github/docs)](https://pkg.go.dev/github.com/github/go-pipe)
+# go-pipe [![GoDoc](https://pkg.go.dev/badge/github.com/github/docs)](https://pkg.go.dev/github.com/github/go-pipe/v2)
 A package used to easily build command pipelines in your Go applications
 
 # Important
 We have not thoroughly tested this package on OSs other than Linux, especially Windows. At this time, using this package on Windows based systems is considered experimental and will be supported only on a best effort basis.
 
 # Links
 
-* [Docs](https://pkg.go.dev/github.com/github/go-pipe)
+* [Docs](https://pkg.go.dev/github.com/github/go-pipe/v2)

go.mod

@@ -1,4 +1,4 @@
-module github.com/github/go-pipe
+module github.com/github/go-pipe/v2
 
 go 1.24.0
 

internal/ptree/ptree_test.go

@@ -9,7 +9,7 @@ import (
 	"strconv"
 	"testing"
 
-	"github.com/github/go-pipe/internal/ptree"
+	"github.com/github/go-pipe/v2/internal/ptree"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

pipe/command_linux.go

@@ -5,7 +5,7 @@ package pipe
 import (
 	"context"
 
-	"github.com/github/go-pipe/internal/ptree"
+	"github.com/github/go-pipe/v2/internal/ptree"
 )
 
 // On linux, we can limit or observe memory usage in command stages.

pipe/command_starterror_test.go

@@ -6,7 +6,7 @@ import (
 	"os/exec"
 	"testing"
 
-	"github.com/github/go-pipe/pipe"
+	"github.com/github/go-pipe/v2/pipe"
 )
 
 // TestCommandStageStartFailureNoRace verifies that when `cmd.Start()`

pipe/memorylimit_test.go

@@ -12,7 +12,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/github/go-pipe/pipe"
+	"github.com/github/go-pipe/v2/pipe"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )

pipe/pipe_matching_test.go

@@ -7,7 +7,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/github/go-pipe/pipe"
+	"github.com/github/go-pipe/v2/pipe"
 	"github.com/stretchr/testify/assert"
 )
 

pipe/pipeline_test.go

@@ -18,7 +18,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.uber.org/goleak"
 
-	"github.com/github/go-pipe/pipe"
+	"github.com/github/go-pipe/v2/pipe"
 )
 
 // Check whether this package's test suite leaks any goroutines: