cmd/root.go: change version to v0.6.9

cmd/root.go: update version to print out to v0.6.8

Replace at-tip checks with utils functions from the latest sdk (coinb…

…ase#212)

* replace at-tip checks with utils functions from latest sdk

* check for nil blockidentifier

* lint

* update version

Merge pull request coinbase#207 from coinbase/patrick/fix-findtransac…

…tion-regression

[bug] Fix `FindTransaction` Regression

Merge pull request coinbase#206 from coinbase/patrick/sdk-v0.6.6

[email protected]

Merge pull request coinbase#203 from coinbase/patrick/support-synced-tip

[chore] Support SyncStatus.Synced Tip + ForceInactiveReconciliation

Merge pull request coinbase#200 from omerzach/patch-1

Fix typo of "indicate" in README.md

Merge pull request coinbase#196 from coinbase/patrick/update-rosetta-…

…sdk-go-v0.6.3

[email protected]

Merge pull request coinbase#193 from coinbase/patrick/update-sdk-version

[chore] Update `rosetta-sdk-go`

Merge pull request coinbase#187 from coinbase/patrick/v1.4.8-upgrade

[chore] `[email protected]` Upgrade