fix: TSError: ? Unable to compile TypeScript when running 'gulp:build'

[kuncevic]

fix (gulp task): change Promise<void> to Promise<{}>

When running gulp build or gulp serve:devapp getting an error TSError: ? Unable to compile TypeScript tools\gulp\tasks\release.ts (52,10): Type 'Promise<{}>' is not assignable to type 'Promise<void>'

[crisbeto]

It seems like this is the same change as in #2131. I've closed one of them.

[jelbourn]

LGTM

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