panic when package/file exists in GOPATH root

[mastercactapus]

Running gopkgs while a file having a non-main package is in the root of GOPATH, it panics.

Steps To Reproduce

1. Create foo.go with the line package foo at $GOPATH/src/foo.go
2. Run gopkgs

Observed Behavior

It panics.

Expected Behavior

No panic, the file(s) should be ignored as invalid.

Example Output

$ echo "package foo" >$GOPATH/src/foo.go
$ gopkgs
panic: runtime error: slice bounds out of range

goroutine 96 [running]:
github.com/uudashr/gopkgs.Packages.func1(0xc4202e1ec0, 0x20, 0x6b3440, 0xc42035b450, 0x0, 0x0, 0x0, 0x0)
	/home/nathan/projects/src/github.com/uudashr/gopkgs/gopkgs.go:68 +0x5a6
github.com/MichaelTJones/walk.(*WalkState).visitFile(0xc420251310, 0xc42000a920, 0x19, 0x6b3440, 0xc42035b450)
	/home/nathan/projects/src/github.com/MichaelTJones/walk/walk.go:125 +0x467
github.com/MichaelTJones/walk.(*WalkState).visitChannel(0xc420251310)
	/home/nathan/projects/src/github.com/MichaelTJones/walk/walk.go:71 +0xd9
created by github.com/MichaelTJones/walk.Walk
	/home/nathan/projects/src/github.com/MichaelTJones/walk/walk.go:157 +0x1f1

Ran into this after some digging into why unimported autocomplete wasn't working in vscode for me.

[uudashr]

Thanks for the report.. fixed. You need to update the gopkgs