The base port value is incorrect

[yukihirop]

Summary

$ ultraman start
22:11:30 system | web.1  start at pid: 91352
22:11:32 web.1  | => Booting Puma
22:11:32 web.1  | => Rails 5.2.4.4 application starting in development
22:11:32 web.1  | => Run `rails server -h` for more startup options
22:11:32 web.1  | Puma starting in single mode...
22:11:32 web.1  | * Version 3.12.6 (ruby 2.5.3-p105), codename: Llamas in Pajamas
22:11:32 web.1  | * Min threads: 5, max threads: 5
22:11:32 web.1  | * Environment: development
22:11:32 web.1  | * Listening on tcp://localhost:4999
22:11:32 web.1  | Use Ctrl-C to stop
22:12:05 web.1  | Started GET "/" for ::1 at 2020-12-25 22:12:05 +0900

Expected

port is 5000

Version

$ ultraman --version
ultraman "0.1.2 ( rev: c5d1f03, rustc: 1.48.0, build at: 2020/12/25 12:29:56 )"

[yukihirop]

Also fix the following

warning: use of deprecated function `dotenv::from_path_iter`: please use `from_path` in conjunction with `var` instead
  --> src/env.rs:10:33
   |
10 |     if let Some(iter) = dotenv::from_path_iter(filepath.as_path()).ok() {
   |                                 ^^^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: `ultraman` (bin "ultraman" test) generated 1 warning
    Finished test [unoptimized + debuginfo] target(s) in 2.57s
     Running unittests (target/debug/deps/ultraman-bb3643b00a0b9296)