When Xcode is upgrade, Xcode Plugin will not work at all. Use this script to update all your Xcode plugin's compatibility.

update_xcode_plugin_compat.sh

#!/bin/bash
# When Xcode is upgrade, Xcode Plugin will not work at all.
# Use this script to update all your Xcode plugin's compatibility.
# https://github.com/supermarin/Alcatraz/issues/213#issuecomment-91288935

# show Xcode version and UUID
xcodebuild -version
uuid=$(defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID)
echo "UUID $uuid"
echo ""

find ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins -name Info.plist -maxdepth 3 | while read plist
do
    # check UUID
    if [ -n "$(defaults read "$plist" | grep $uuid)" ] ; then
        echo "UUID is already added to $plist"
        continue
    fi

    # add UUID to .plist
    echo "Add UUID to $plist"
    defaults write "$plist" DVTPlugInCompatibilityUUIDs -array-add $uuid
done