Add flatMap to Fluent

package.json

@@ -1,6 +1,6 @@
 {
   "name": "paravel",
-  "version": "0.4.9",
+  "version": "0.4.10",
   "description": "Yet another toolkit for nostr",
   "author": "hodlbod",
   "license": "MIT",

src/util/nostr.ts

@@ -120,6 +120,8 @@ export class Fluent<T> {
 
   map = <U>(f: (t: T) => U) => new Fluent(this.xs.map(f))
 
+  flatMap = <U>(f: (t: T) => U) => new Fluent(this.xs.flatMap(f))
+
   pluck = (k: number | string) => new Fluent(this.xs.map(x => x[k]))
 
   filter = (f: (t: T) => boolean) => new Fluent(this.xs.filter(f))