Update CHANGELOG.md

[akshay-ap]

Fixes #790

Changes in PR:

• Mention new added contracts: SafeMigration and SafeToL2Setup
• Mention new module guard interface IModuleGuard
• Update expected contract addresse

[coveralls]

Pull Request Test Coverage Report for Build 10630626622

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.478%

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Totals
Change from base Build 10613396108:	0.0%
Covered Lines:	386
Relevant Lines:	398

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💛 - Coveralls

[mmv08]

In my understanding, the new migration contracts will be released as an incremental release of 1.4.1 (1.4.1-3 or something similar) and not as part of 1.5.0.

If we decide to release it as part of 1.5.0, that means we released a version without providing an upgrade mechanism, so I believe the migration contract should be part of the 1.4.1 changelog. I'm not sure about the SafeToL2Setup, but I think it's alright if we do it in 1.4.1 as well.

[akshay-ap]

In my understanding, the new migration contracts will be released as an incremental release of 1.4.1 (1.4.1-3 or something similar) and not as part of 1.5.0.

If we decide to release it as part of 1.5.0, that means we released a version without providing an upgrade mechanism, so I believe the migration contract should be part of the 1.4.1 changelog. I'm not sure about the SafeToL2Setup, but I think it's alright if we do it in 1.4.1 as well.

Fine with moving to 1.4.1.
cc @nlordell