mark readme code snippets as a golang code

README.md

@@ -8,21 +8,27 @@ The library provides `Reader` type and two constructors for it.
 
 Common constructor `NewReader` gets opened file (`io.Reader`) and log format (`string`) as argumets. format is in form os nginx `log_format` string.
 
-	reader := gonx.NewReader(file, format)
+```go
+reader := gonx.NewReader(file, format)
+```
 
 `NewNginxReader` provides mo magic. It gets nginx config file (`io.Reader`) as second argument and `log_format` name (`string`) a third.
 
-	reader := gonx.NewNginxReader(file, nginxConfig, format_name)
+```go
+reader := gonx.NewNginxReader(file, nginxConfig, format_name)
+```
 
 `Reader` implements `io.Reader`. Here is example usage
 
-	for {
-		rec, err := reader.Read()
-		if err == io.EOF {
-			break
-		}
-		// Process the record... e.g.
+```go
+for {
+	rec, err := reader.Read()
+	if err == io.EOF {
+		break
 	}
+	// Process the record... e.g.
+}
+```
 
 See more examples in `example/*.go` sources.
 
@@ -48,4 +54,4 @@ This library API and internal representation can be changed at any moment, but I
 
 ## Contributing
 
-Fork the repo, create a feature branch then send me pull request. Feel free to create new issues or contact me using email.
+Fork the repo, create a feature branch then send me pull request. Feel free to create new issues or contact me using email.