Incompatibility with Rosetta API v1.4.10 - /account/coins invocation is missing

**Describe the bug**
When `rosetta-cli` loads configuration file with imported prefunded accounts and tries to fetch their balances, `rosetta-cli` receives only balances without any coin identifiers, which is especially important for UTXO based blockchains. So `find_balance` action with `require_coin` parameter set to `true` at construction API script returns account without any coin identifiers.

In this case the following execution of a script for construction API is impossible in an automated way (without specifying coin identifiers manually).

It seems that the main cause for this behavior is usage of `rosetta-sdk-go v0.6.8`, which already supports separate /account/coin method invocation. Please, see this [link](https://www.rosetta-api.org/docs/AccountApi.html#accountcoins), which refers to the Rosetta API note about this applied decomposition

It doesn't seem to be a bug completely, however the usage of `rosetta-cli v0.6.7` is uncomfortable

**To Reproduce**
Steps to reproduce the behavior:
1. [Download](https://github.com/coinbase/rosetta-bitcoin/tree/v0.0.9) `rosetta-bitcoin` implementation
2. Modify `rosetta-bitcoin/rosetta-cli-conf/testnet/config.json` by adding prefunded accounts with construction configuration section
3. Run `rosetta-bitcoin` implementation by executing `make run-testnet-online` inside of the `rosetta-bitcoin` root directory
2. Install `rosetta-cli v0.6.7`
3. Run `rosetta-cli check:construction` with configuration file implemented at `rosetta-bitcoin/rosetta-cli-conf/testnet/bitcoin.ros`

**Expected behavior**
Invocation of `rosetta-cli check:construction --configuration-file=path_to_file` should transfer funds from imported prefunded account defined at configuration file to another account

**Additional context**
It may be a little bit clearer, if you also have a look at the line in `rosetta-cli` code [here](https://github.com/coinbase/rosetta-cli/blob/master/pkg/tester/construction.go#L213), where account balances fetching invokes first. Going deeper you may find, that returned account balances don't have any coin identifiers