Fix run process become a zombie.

[masato-hi]

Fixes an issue where the process becomes a zombie because runBin() is not calling wait().

see: https://man7.org/linux/man-pages/man2/wait.2.html

Environment

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.4 LTS"

Steps to reproduce.

$ echo '[build]
  bin = "app"
  cmd = "go build -o app ."
' > .air.toml

$ echo 'package main

import "fmt"

func main() {
  fmt.Println("Hello World!")
}
' > main.go

$ go mod init example.com/m

$ air

Before

$ sed -i -e 's/!/!!/g' main.go # Replace a code.
$ sleep 1 # Wait build.
$ ps f --ppid $(pidof air)
    PID TTY      STAT   TIME COMMAND
 954786 pts/7    Z      0:00 [sh] <defunct>
 954523 pts/7    Z      0:00 [sh] <defunct>

After

$ sed -i -e 's/!/!!/g' main.go # Replace a code
$ sleep 1 # Wait build.
$ ps f --ppid $(pidof air)
    PID TTY      STAT   TIME COMMAND

[codecov]

Codecov Report

Merging #293 (3e87b7c) into master (8a2d83a) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
+ Coverage   64.04%   64.08%   +0.03%     
==========================================
  Files           7        7              
  Lines         940      941       +1     
==========================================
+ Hits          602      603       +1     
  Misses        269      269              
  Partials       69       69              

Impacted Files	Coverage Δ
runner/engine.go	57.85% <100.00%> (+0.11%)	⬆️

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[xiantang]

LGTM

[xiantang]

thx