Add argument "--framework netcoreapp3.0" to Create PublishedBot.zip

[BruceHaley]

Fixes "error : The 'Publish' target is not supported without specifying a target framework"

(I picked 3.0 instead of 2.1 or 2.2. It seems to work in my test build, but this ought to tell for sure.)

[coveralls]

Pull Request Test Coverage Report for Build 98780

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 23 unchanged lines in 19 files lost coverage.
• Overall coverage decreased (-0.3%) to 77.893%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder/Adapters/TestFlow.cs	1	79.67%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/EmitEvent.cs	1	55.56%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/GetActivityMembers.cs	1	30.77%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/IfCondition.cs	1	76.47%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/SignOutUser.cs	1	63.64%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Actions/SwitchCondition.cs	1	80.49%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/DialogManager.cs	1	81.03%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Generators/ActivityChecker.cs	1	86.62%
/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Testing/TestActions/AssertReplyActivity.cs	1	80.77%
/libraries/Microsoft.Bot.Builder.Dialogs/ObjectPath.cs	1	86.03%

Totals
Change from base Build 98755:	-0.3%
Covered Lines:	31284
Relevant Lines:	40163

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Integration.ApplicationInsights.Core.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Integration.AspNet.Core.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Testing.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.6.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Streaming.dll compared against version 4.6.3