message: fix: use https for default testnet node
diff: @@ -100,7 +100,7 @@ export class StacksMainnet implements StacksNetwork {
  export class StacksTestnet extends StacksMainnet implements StacksNetwork {
  version = TransactionVersion.Testnet;
  chainId = ChainID.Testnet;
  - coreApiUrl = 'http://stacks-node-api.blockstack.org';
  + coreApiUrl = 'https://stacks-node-api.blockstack.org';
  }
  export class StacksMocknet extends StacksMainnet implements StacksNetwork {
  