update .gitignore

node_modules/@pm2/io/build/main/utils/metrics/counter.d.ts

@@ -0,0 +1,10 @@
+export default class Counter {
+    private _count;
+    private used;
+    constructor(opts?: any);
+    val(): number;
+    inc(n?: number): void;
+    dec(n?: number): void;
+    reset(count?: number): void;
+    isUsed(): boolean;
+}