Hi,

thank you for this package.

I got an error when i try to generate a php api. This is error

panic: interface conversion: interface is nil, not map[string]interface {}

goroutine 1 [running]:
runtime.panic(0x6ff260, 0xc210086dc0)
    /usr/local/lib/gvm/gos/go1.2/src/pkg/runtime/panic.c:266 +0xb6
github.com/pksunkara/alpaca/alpaca.WritePhp(0xc2100b1b40)
    /usr/local/lib/gvm/pkgsets/go1.2/global/src/github.com/pksunkara/alpaca/alpaca/langs_php.go:37 +0x535
github.com/pksunkara/alpaca/alpaca.WriteLibraries(0xc21000a938)
    /usr/local/lib/gvm/pkgsets/go1.2/global/src/github.com/pksunkara/alpaca/alpaca/alpaca.go:66 +0x88
main.main()
    /usr/local/lib/gvm/pkgsets/go1.2/global/src/github.com/pksunkara/alpaca/main.go:52 +0x21a

goroutine 5 [finalizer wait]:
runtime.park(0x40adc0, 0xaf4450, 0xaf1c68)
    /usr/local/lib/gvm/gos/go1.2/src/pkg/runtime/proc.c:1342 +0x66
runfinq()
    /usr/local/lib/gvm/gos/go1.2/src/pkg/runtime/mgc0.c:2276 +0x84
runtime.goexit()
    /usr/local/lib/gvm/gos/go1.2/src/pkg/runtime/proc.c:1394

Thank you