docs: golangci-lint related changes (#12)

Co-authored-by: Oleksandr Redko <oleksandr.red+github@gmail.com>

readme.md

@@ -35,6 +35,10 @@ func IsValidHostname(hostname string, fqdn bool) bool {
 go install github.com/butuzov/mirror/cmd/mirror@latest
 ```
 
+### `golangci-lint`
+`golangci-lint` supports `mirror` since `v1.53.0`
+
+
 ## How to use
 
 You run `mirror` with [`go vet`](https://pkg.go.dev/cmd/vet):
@@ -55,6 +59,47 @@ mirror ./...
 /air/runner/util.go:173:14: avoid allocations with (*os.File).WriteString
 ```
 
+With [`golangci-lint`](https://github.com/golangci/golangci-lint)
+
+```
+golangci-lint run --no-config --disable-all -Emirror
+# github.com/argoproj/argo-cd
+test/e2e/fixture/app/actions.go:83:11: avoid allocations with (*os.File).WriteString (mirror)
+	_, err = tmpFile.Write([]byte(data))
+	         ^
+server/server.go:1166:9: avoid allocations with (*regexp.Regexp).MatchString (mirror)
+	return mainJsBundleRegex.Match([]byte(filename))
+	       ^
+server/account/account.go:91:6: avoid allocations with (*regexp.Regexp).MatchString (mirror)
+	if !validPasswordRegexp.Match([]byte(q.NewPassword)) {
+	    ^
+server/badge/badge.go:52:20: avoid allocations with (*regexp.Regexp).FindAllStringSubmatchIndex (mirror)
+	for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
+	                  ^
+util/cert/cert.go:82:10: avoid allocations with (*regexp.Regexp).MatchString (mirror)
+		return validHostNameRegexp.Match([]byte(hostname)) || validIPv6Regexp.Match([]byte(hostname))
+```
+
 ## Command line
 
 - You can add checks for `_test.go` files with cli option `--with-tests`
+
+### `golangci-lint`
+  With `golangci-lint` tests are checked by default and can be can be turned off by using the regular `golangci-lint` ways to do it:
+
+  - flag `--tests` (e.g. `--tests=false`)
+  - flag `--skip-files` (e.g. `--skip-files="_test.go"`)
+  - yaml confguration `run.skip-files`:
+    ```yaml
+    run:
+      skip-files:
+        - '(.+)_test\.go'
+    ```
+  - yaml confguration `issues.exclude-rules`:
+    ```yaml
+      issues:
+        exclude-rules:
+          - path: '(.+)_test\.go'
+            linters:
+              - mirror
+      ```