update source (#14)

Reviewed-on: #14
Co-authored-by: andrey <andrey@4devs.io>
Co-committed-by: andrey <andrey@4devs.io>

example/log.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"context"
+
+	"gitoa.ru/go-4devs/log"
+	"gitoa.ru/go-4devs/log/field"
+)
+
+func main() {
+	ctx := context.Background()
+
+	log.DebugKV(ctx, "debug message")
+	log.ErrKV(ctx, "error message")
+	log.Errf(ctx, "format error message:%v", 42)
+	log.Err(ctx, "error message", 42)
+	service(ctx, log.Log())
+
+	logger := log.New(log.WithJSONFormat()).With(log.WithSource(10, log.TrimPath))
+	logger.AlertKV(ctx, "alert message new logger", field.String("string", "value"))
+	service(ctx, logger)
+}
+
+func service(ctx context.Context, logger log.Logger) {
+	logger = logger.With(log.WithName("service"))
+	logger.WarnKV(ctx, "warn service message")
+	otherService(ctx, logger)
+}
+
+func otherService(ctx context.Context, logger log.Logger) {
+	logger = logger.With(log.WithName("other_service"))
+	logger.WarnKV(ctx, "warn other service message")
+}