Merge pull request #1590 from webtorrent/update-electron

Update to electron 4; it may not be perfect, but we have to move on

src/main/windows/main.js

@@ -40,7 +40,7 @@ function init (state, options) {
     minWidth: config.WINDOW_MIN_WIDTH,
     show: false,
     title: config.APP_WINDOW_TITLE,
-    titleBarStyle: 'hidden-inset', // Hide title bar (Mac)
+    titleBarStyle: 'hiddenInset', // Hide title bar (Mac)
     useContentSize: true, // Specify web page size without OS chrome
     width: initialBounds.width,
     x: initialBounds.x,
@@ -209,7 +209,7 @@ function toggleDevTools () {
   if (main.win.webContents.isDevToolsOpened()) {
     main.win.webContents.closeDevTools()
   } else {
-    main.win.webContents.openDevTools({ detach: true })
+    main.win.webContents.openDevTools({ mode: 'detach' })
   }
 }