Fix download URL

Author: piranna

package.json

@@ -20,7 +20,7 @@
   "scripts": {
     "BigRedButton": "scripts/BigRedButton",
     "build": "scripts/preinstall && scripts/build && scripts/postinstall",
-    "install": "prebuild --download https://github.com/NodeOS/nodeos-cross-toolchain/releases/download/{version}/{platform}-{arch}.tar.gz",
+    "install": "prebuild --download https://github.com/NodeOS/nodeos-cross-toolchain/releases/download/v{version}/{platform}-{arch}.tar.gz",
     "test": "scripts/test",
     "unbuild": "scripts/unbuild"
   },