message: Add ethers v5 target to tsconfig reference path
diff: { "path": "./packages/target-truffle-v4/tsconfig.build.json" },
  { "path": "./packages/target-truffle-v5/tsconfig.build.json" },
  { "path": "./packages/target-ethers-v4/tsconfig.build.json" },
  + { "path": "./packages/target-ethers-v5/tsconfig.build.json" }
  ]
  }
  