removed extra comma in package.json

Fixed JSON formatting in package.json by removing trailing comma

Author: davidferguson

package.json

@@ -11,7 +11,7 @@
     "start": "electron .",
     "build-mac": "find . -name .DS_Store -depth -exec rm {} \\; && npm dedupe && electron-packager ./ PiBakery --platform=darwin --arch=all --version=1.3.2 --overwrite --prune --app-version=0.3.0 --icon=./app/img/icon.icns",
     "build-win": "npm dedupe && electron-packager ./ PiBakery --platform=win32 --arch=ia32 --version=1.3.2 --overwrite --prune --app-version=0.3.0 --icon=./app/img/icon.ico",
-    "build-linux": "find . -name .DS_Store -depth -exec rm {} \\; && npm dedupe && electron-packager ./ PiBakery --platform=linux --arch=all --version=1.3.2 --overwrite --prune --app-version=0.3.0 --icon=./app/img/icon.icns",
+    "build-linux": "find . -name .DS_Store -depth -exec rm {} \\; && npm dedupe && electron-packager ./ PiBakery --platform=linux --arch=all --version=1.3.2 --overwrite --prune --app-version=0.3.0 --icon=./app/img/icon.icns"
   },
   "optionalDependencies": {
     "elevator": "^1.0.0",