Cannot open dev tools

[patricknelson]

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Also @amitmerchant1990 in my attempts to get in here to look at #19 and fix it, I can no longer trigger dev tools optionally without uncommenting the mainWindow.webContents.openDevTools(); in main.js :thinking: I'm not super familiar with Electron so I'm not sure why the changes made since my last edits would prevent this from happening.

Sorry for all the issues but I figured I should open this one separately.

[patricknelson]

Diff from when it was working to now (using hash for master so it's future proof): https://github.com/amitmerchant1990/electron-markdownify/compare/4f8ad7fcd0fe362731ccb7e04d1453f4705d0bec...35bfb5f9e2d87ceb3df3fe28eb5d5c8ad82e951b