add exports field to package.json

ESM projects can now import the tree-shakeable ESM code.
Node.js doesn't use the "module" field.

Author: dynst

package.json

@@ -2,8 +2,10 @@
   "name": "hash-wasm",
   "version": "4.12.0",
   "description": "Lightning fast hash functions for browsers and Node.js using hand-tuned WebAssembly binaries (MD4, MD5, SHA-1, SHA-2, SHA-3, Keccak, BLAKE2, BLAKE3, PBKDF2, Argon2, bcrypt, scrypt, Adler-32, CRC32, CRC32C, RIPEMD-160, HMAC, xxHash, SM3, Whirlpool)",
-  "main": "dist/index.cjs",
-  "module": "dist/index.mjs",
+  "exports": {
+    "require": "dist/index.cjs",
+    "default": "dist/index.mjs"
+  },
   "types": "dist/lib/index.d.ts",
   "scripts": {
     "build": "sh -c ./scripts/build.sh",