Downgrade electron-builder due to bug, downgrade icon-maker too

The latest electron-builder came with a fix for one of our bugs as well
as a new bug that blocks builds on Windows: electron-userland/electron-builder#2462

There's no good reason to upgrade icon-maker. And a good reason to keep at the version on github: jaretburkett/electron-icon-maker#7

package.json

@@ -69,9 +69,9 @@
     "bower": "^1.8.2",
     "chai": "^4.1.2",
     "electron": "1.7.10",
-    "electron-builder": "^19.53.4",
-    "electron-icon-maker": "^0.0.4",
-    "electron-publisher-s3": "^19.53.4",
+    "electron-builder": "^19.52.1",
+    "electron-icon-maker": "0.0.3",
+    "electron-publisher-s3": "^19.52.1",
     "eslint": "^4.14.0",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-import": "^2.8.0",