"invalid argument" when the chosen snippet includes <param> on WSL

[taketori]

On Microsoft Windows [Version 10.0.15063]'s WSL

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.2 LTS
Release:        16.04
Codename:       xenial
$ pet version
pet version 0.2.2 (was extracted from downloaded .zip file)
$ cat .config/pet/config.toml
[General]
  snippetfile = "/home/taketori/.config/pet/snippet.toml"
  editor = "micro"
  column = 40
  selectcmd = "fzf"

[Gist]
  file_name = "pet-snippet.toml"
  access_token = ""
  gist_id = ""
  public = false
$ pet list
Description: test1
    Command: echo <param=aaa>
------------------------------
Description: test2
    Command: echo <param>
------------------------------
Description: test3
    Command: echo aaa
------------------------------

both test1 and test2 show error like below:
(test3 does not.)

$ pet exec
2017/05/05 23:59:49 invalid argument
panic: invalid argument


goroutine 1 [running]:
log.Panicln(0xc42003d830, 0x1, 0x1)
        /usr/local/Cellar/go/1.8/libexec/src/log/log.go:336 +0xc0
github.com/knqyf263/pet/dialog.GenerateParamsLayout(0xc42001c150, 0xc420095af0, 0xc)
        /Users/teppei/src/github.com/knqyf263/pet/dialog/view.go:36 +0xac
github.com/knqyf263/pet/cmd.filter(0x0, 0x0, 0x0, 0xc420092f90, 0x26, 0x0, 0x0, 0x0)
        /Users/teppei/src/github.com/knqyf263/pet/cmd/util.go:76 +0xcc2
github.com/knqyf263/pet/cmd.execute(0xabc620, 0xadd008, 0x0, 0x0, 0x0, 0x0)
        /Users/teppei/src/github.com/knqyf263/pet/cmd/exec.go:28 +0x7c
github.com/knqyf263/pet/vendor/github.com/spf13/cobra.(*Command).execute(0xabc620, 0xadd008, 0x0, 0x0, 0xabc620, 0xadd008)
        /Users/teppei/src/github.com/knqyf263/pet/vendor/github.com/spf13/cobra/command.go:644 +0x3f2
github.com/knqyf263/pet/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0xabcc80, 0xc42006c058, 0x0, 0xac0468)
        /Users/teppei/src/github.com/knqyf263/pet/vendor/github.com/spf13/cobra/command.go:734 +0x339
github.com/knqyf263/pet/vendor/github.com/spf13/cobra.(*Command).Execute(0xabcc80, 0x1, 0x0)
        /Users/teppei/src/github.com/knqyf263/pet/vendor/github.com/spf13/cobra/command.go:693 +0x2b
github.com/knqyf263/pet/cmd.Execute()
        /Users/teppei/src/github.com/knqyf263/pet/cmd/root.go:47 +0x31
main.main()
        /Users/teppei/src/github.com/knqyf263/pet/main.go:20 +0x20

[krsfrodaslz]

jroimartin/gocui#154
nsf/termbox-go#174