add @ts-self-types for signaturealgo.js

Author: Srabutdotcom

deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@tls/extension",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "exports": "./src/mod.ts",
   "publish": {
     "exclude": ["dist/"]

src/signaturealgo.js

@@ -1,3 +1,4 @@
+//@ts-self-types = "../type/signaturealgo.d.ts"
 import { SignatureScheme } from "@tls/enum";
 import { Constrained, Uint16 } from "./dep.ts";
 import { Struct } from "./dep.ts";