Update Writer interface

src/types.ts

@@ -26,9 +26,9 @@ export type WriterOptions = {
 }
 
 export abstract class Writer {
-    protected readonly _options: WriterOptions;
-    public constructor(options: WriterOptions) {
-        this._options = options
+    protected readonly _options: WriterOptions = {
+        minLevel: Level.INFO,
+        with_color: false,
     }
 
     public log(level: Level, ...data: any[]) : void {