fix help url in readme
fix help url in readme

douglaskastle/bootswatch,thomaspark/bootswatch,nkraft/bootswatch,douglaskastle/bootswatch,nicolasmccurdy/bootswatch,thomaspark/bootswatch,nicolasmccurdy/bootswatch,nicolasmccurdy/bootswatch,douglaskastle/bootswatch,douglaskastle/bootswatch,nkraft/bootswatch,thomaspark/bootswatch,nkraft/bootswatch