fix: change from transfer to call value

[0xvangrim]

Issue: #84

Change from transfer to .call.value

[AugustoL]

Test missing, you can check by sending ETH to a contract that cannot doesnt have the fallback set.

[AugustoL]

Change menssage to "eth transfer failed"

[0xvangrim]

Test missing, you can check by sending ETH to a contract that cannot doesnt have the fallback set.

You've written a test for this one already in Controller.js

var tx = await controller.sendEther(
      web3.utils.toWei("1", "ether"),
      otherAvatar.address,
      avatar.address
    );
    await avatar
      .getPastEvents("SendEther", {
        filter: { _addr: avatar.address }, // Using an array means OR: e.g. 20 or 23
        fromBlock: tx.blockNumber,
        toBlock: "latest",
      })
      .then(function (events) {
        assert.equal(events[0].event, "SendEther");
      });
    var avatarBalance =
      (await web3.eth.getBalance(avatar.address)) /
      web3.utils.toWei("1", "ether");
    assert.equal(avatarBalance, 0);
    var otherAvatarBalance =
      (await web3.eth.getBalance(otherAvatar.address)) /
      web3.utils.toWei("1", "ether");
    assert.equal(otherAvatarBalance, 1);
  });```