Remove "--version" flag from build script.
Remove "--version" flag from build script.

Removing the "--version" flag from the build script means
electron-packager will use the version of Electron that's defined in the
package.json dependencies section. Because we explicitly pinned that
version, we no longer to two places to remember to update things when we
bump the Electron version.

rapid7/awsaml,rapid7/awsaml,rapid7/awsaml