[#3] dialer: Add gopatchs patch.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

Makefile

@@ -4,3 +4,6 @@ integration-test:
 
 test:
 	go test -count=1 -v ./...
+
+patch-example:
+	gopatch -d -p ./multinet.patch ./testdata/patch*

README.md

@@ -39,3 +39,11 @@ if err != nil {
 `NetlinkWatcher` can wrap `Multidialer` type and perform all updates automatically.
 
 TODO: describe needed capabilities here.
+
+## Patch
+
+To perform refactoring (use `multinet.Dial` instead of `net.Dial`) using [gopatch](https://github.com/uber-go/gopatch):
+
+```bash
+gopatch -p ./multinet.patch <project directory>
+```

multinet.patch

@@ -0,0 +1,7 @@
+@@
+@@
++import "git.frostfs.info/TrueCloudLab/multinet"
+-import "net"
+
+-net.Dial(...)
++multinet.Dial(...)

testdata/patch_0.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"log"
+	"net"
+)
+
+const addr = "s01.frostfs.devenv:8080"
+
+func main() {
+	_, err := net.Dial(getNetwork(), addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func getNetwork() string {
+	return "tcp"
+}

testdata/patch_1.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"log"
+	"net"
+)
+
+func main() {
+	ip := net.IPv4(192, 168, 0, 10)
+	_, err := net.Dial("tcp", ip.String()+":8080")
+	if err != nil {
+		log.Fatal(err)
+	}
+}