cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal

[KjellMorgenstern]

When running
go get github.com/fritzing/fzp/bin/fzp

The following error shows:

../../bin/fzp/command-create.go:13:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:18:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:22:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:27:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:31:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:36:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:40:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:44:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-create.go:48:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-encode.go:15:16: cannot use cli.StringFlag literal (type cli.StringFlag) as type cli.Flag in array or slice literal:
        cli.StringFlag does not implement cli.Flag (Apply method has pointer receiver)
../../bin/fzp/command-encode.go:15:16: too many errors

The library used for CLI parsing slighlt changed with v2, code should be adapted to work with the new library version.
More details (and a suggestion how to fix) could be here: urfave/cli#459