Include if with inline error handling

[Foxboron]

This pattern is widely enough used to be a snippet i believe.
Examples from one golang.org example.

// ...
   if err := cmd.Start(); err != nil {
   	log.Fatal(err)
   }
// ...
   if err := json.NewDecoder(stdout).Decode(&person); err != nil {
   	log.Fatal(err)
   }
   if err := cmd.Wait(); err != nil {
   	log.Fatal(err)
   }

[fatih]

I think the current snippets are well defined @Foxboron You're free to define your own ones. Plus no ones fatal.

We can improve two things here:

1. remove the log.Fatal part and jump there with the next step
2. also add it to neopsnippet file

Once these are done, I think we can merge this PR.

[Foxboron]

Done. Also modified the commit message. I don't use neosnippet so i hope that definition is correct.

[fatih]

Thanks @Foxboron 👍