fix: import path should be github.com/ooni/probe-cli/v3 (#200)

See https://github.com/ooni/probe/issues/1335#issuecomment-771499511

internal/log/handlers/batch/batch.go

@@ -1,33 +0,0 @@
-package batch
-
-import (
-	j "encoding/json"
-	"io"
-	"os"
-	"sync"
-
-	"github.com/apex/log"
-)
-
-// Default handler outputting to stderr.
-var Default = New(os.Stderr)
-
-// Handler implementation.
-type Handler struct {
-	*j.Encoder
-	mu sync.Mutex
-}
-
-// New handler.
-func New(w io.Writer) *Handler {
-	return &Handler{
-		Encoder: j.NewEncoder(w),
-	}
-}
-
-// HandleLog implements log.Handler.
-func (h *Handler) HandleLog(e *log.Entry) error {
-	h.mu.Lock()
-	defer h.mu.Unlock()
-	return h.Encoder.Encode(e)
-}