Update CHANGELOG-1.7.md

1.8.2 Release

1.7.8 Release

1.8.1 Release

1.8.0 Release

1.7.7 Release

[stable] Fix auto-update (openethereum#6769)

* v1.7.7

* Updated ethabi to fix auto-update

Updated ethabi to fix auto-update (openethereum#6771)

1.7.6 Release

1.7.5 Release