add mod.ts for deno

Author: gfx

example/deno-with-esmsh.ts

@@ -1,5 +1,5 @@
 #!/usr/bin/env deno run
 /* eslint-disable no-console */
-import * as msgpack from "https://esm.sh/@msgpack/msgpack";
+import * as msgpack from "https://esm.sh/@msgpack/msgpack/mod.ts";
 
 console.log(msgpack.decode(msgpack.encode("Hello, world!")));

example/deno-with-unpkg.ts

@@ -1,5 +1,5 @@
 #!/usr/bin/env deno run
 /* eslint-disable no-console */
-import * as msgpack from "https://unpkg.com/@msgpack/msgpack?module";
+import * as msgpack from "https://unpkg.com/@msgpack/msgpack/mod.ts";
 
 console.log(msgpack.decode(msgpack.encode("Hello, world!")));

package.json

@@ -90,6 +90,7 @@
     "webpack-cli": "latest"
   },
   "files": [
+    "mod.ts",
     "src/**/*.*",
     "dist/**/*.*",
     "dist.es5+umd/**/*.*",