fix log this context

Author: jifalops

src/lib/log.ts

@@ -25,16 +25,16 @@ export class Log {
 	setLevel(level: number) {
 		this.level = level;
 		if (level >= Log.ASSERT) this.assert = console.assert.bind(console);
-		else this.assert = function () {};
+		else this.assert = () => {};
 		if (level >= Log.ERROR) this.error = console.error.bind(console);
-		else this.error = function () {};
+		else this.error = () => {};
 		if (level >= Log.WARN) this.warn = console.warn.bind(console);
-		else this.warn = function () {};
+		else this.warn = () => {};
 		if (level >= Log.INFO) this.info = console.info.bind(console);
-		else this.info = function () {};
+		else this.info = () => {};
 		if (level >= Log.DEBUG) this.debug = console.debug.bind(console);
-		else this.debug = function () {};
+		else this.debug = () => {};
 		if (level >= Log.TRACE) this.trace = console.log.bind(console);
-		else this.trace = function () {};
+		else this.trace = () => {};
 	}
 }