Added target web

We use the web target in ccwallet.

Author: MarcelKlammer

package.json

@@ -5,6 +5,7 @@
   "scripts": {
     "rust:build-nodejs": "rimraf ./rust/pkg && cd rust; wasm-pack build --target=nodejs; wasm-pack pack; cd .. && npm run js:flowgen",
     "rust:build-browser": "rimraf ./rust/pkg && cd rust; wasm-pack build --target=browser; wasm-pack pack; cd .. && npm run js:flowgen",
+    "rust:build-web": "rimraf ./rust/pkg && cd rust; wasm-pack build --target=web; wasm-pack pack; cd .. && npm run js:flowgen",
     "rust:build-asm": "rimraf ./rust/pkg && cd rust; wasm-pack build --target=browser --release; wasm-pack pack && npm run asm:build && npm run js:flowgen",
     "rust:publish": "cd rust && cargo publish && cd ../",
     "asm:build": "./binaryen/bin/wasm2js ./rust/pkg/cardano_serialization_lib_bg.wasm --output ./rust/pkg/cardano_serialization_lib.asm.js && node ./scripts/wasm-to-asm",