fix npm install of electron-builder

[Kaffiend]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Fixes difference in versions of electron-builder structure when using npm instead of yarn to install.

• What is the current behavior? (You can also link to an open issue here) Currently if you install with npm you get a different structure of dependencies compared to yarn install

• What is the new behavior (if this is a feature change)? fixes script require based on the two versions possibly installed.

• Other information: Another option exists but would require additional changes to refactor the build process to use the electron-builder cli commands.

[Kaffiend]

fixes #31

[Kaffiend]

build failure has nothing to do with changes. Just Travis not working with ts-node.

[colinskow]

Thanks, I've been busy on other projects, but will take a look over the next few days.