[Security] Bump electron from 1.8.8 to 2.0.18

Bumps [electron](https://github.com/electron/electron) from 1.8.8 to 2.0.18. **This update includes a security fix.**
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](https://github.com/electron/electron/compare/v1.8.8...v2.0.18)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package-lock.json

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@@ -4142,9 +4142,9 @@
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@@ -4748,9 +4748,9 @@
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@@ -6990,9 +6990,9 @@
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