[BotBuilder-AI] Update @azure/ms-rest-js to version 1.8.4

[ParadoxARG]

Fixes #916

Description

Update @azure/ms-rest-js library in botbuilder-ai from version 1.8.2 to 1.8.4(latest). This is a required change because the @azure/cognitiveservices-luis-runtime library is using this version and they are not compatible.

We would also suggest changing the package version from ~1.8.4(1.8.x) to ^1.8.4(1.x) to provide the same compatibility as @azure/cognitiveservices-luis-runtime. If we don't we may have issues if a new minor version is released. Also, we should remove @azure/ms-rest-js from the package-lock.json cause with every patch release the build may break, as @azure/cognitiveservices-luis-runtime is always updating to the last version.

Specific Changes

• change package.json to use @azure/ms-rest-js ~1.8.4

Testing

Build passing:

Tests passing:

[coveralls]

Pull Request Test Coverage Report for Build #2257

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 85.692%

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Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-config/src/botConfigurationBase.ts	2	85.59%

Totals
Change from base Build #2252:	-0.05%
Covered Lines:	3258
Relevant Lines:	3666

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💛 - Coveralls

[stevengum]

Closing in favor of #922.