Bump version to v0.5.0 (MetaMask#48)

This release includes various dependency updates and development
tooling changes. The only functional change is the upgrade of
`trezor-connect` from v7 to v8 (MetaMask#46).

package.json

@@ -1,6 +1,6 @@
 {
   "name": "eth-trezor-keyring",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "A MetaMask compatible keyring, for trezor hardware wallets",
   "main": "index.js",
   "scripts": {