chore: [Security] Bump electron from 4.0.4 to 4.0.8 (#214) [ci skip]

Bumps [electron](https://github.com/electron/electron) from 4.0.4 to 4.0.8. **This update includes security fixes.**
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](electron/electron@v4.0.4...v4.0.8)

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

yarn.lock

@@ -2430,9 +2430,9 @@ electron-download@^4.1.0:
     sumchecker "^2.0.2"
 
 electron@^4.0.1:
-  version "4.0.4"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-4.0.4.tgz#638e32ccbe9ded1124c3e6dbbaa1e16d37c32019"
-  integrity sha512-zG5VtLrmPfmw1fXY/3BEtRZk7OZ7djQhweZ6rW+R5NeF6s8RTz/AwTGtLoBo4z8wmJ5QTy0Y941FZw4pe5YlpA==
+  version "4.0.8"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-4.0.8.tgz#b7998b16543d2094f081757a0c5afdb8875ea510"
+  integrity sha512-FOBJIHkuv8wc15N+ZyqwDzPavYVu5CHMBEf14jHDWv7QW2vkEIpJjVK+PIT31kfZfvjsIP0j2wvA/FBsiqB7pw==
   dependencies:
     "@types/node" "^10.12.18"
     electron-download "^4.1.0"