gci error format go file with windows line separator

[yougg]

gci -v
#gci version 0.13.4

you can reproduce with following steps

first we have one go file number.go with Windows line separator: CRLF

package main

import (
	"math/rand"
	"fmt"
)

func main() {
	fmt.Println("Number0:", rand.Intn(10))
	fmt.Println("Number1:", rand.Intn(10))
	fmt.Println("Number2:", rand.Intn(10))
}

usually the go source file with Windows line separator CRLF came from git checkout with setting git config --global core.autocrlf true

call cat -Ev to show the line endings

> cat -Ev number.go 
package main^M$
^M$
import (^M$
    "math/rand"^M$
    "fmt"^M$
)^M$
^M$
func main() {^M$
    fmt.Println("Number0:", rand.Intn(10))^M$
    fmt.Println("Number1:", rand.Intn(10))^M$
    fmt.Println("Number2:", rand.Intn(10))^M$
}^M$

try format this go file with gci, it will replaces all of CR to LF after import package lines.

gci diff number.go 

--- number.go
+++ number.go
@@ -1,12 +1,16 @@
-package main
-
-import (
-       "math/rand"
-       "fmt"
-)
-
-func main() {
-       fmt.Println("Number0:", rand.Intn(10))
-       fmt.Println("Number1:", rand.Intn(10))
-       fmt.Println("Number2:", rand.Intn(10))
-}
+package main
+
+import (
+       "fmt"
+       "math/rand"
+)
+
+func main() {
+
+       fmt.Println("Number0:", rand.Intn(10))
+
+       fmt.Println("Number1:", rand.Intn(10))
+
+       fmt.Println("Number2:", rand.Intn(10))
+
+}

except correct format result:

--- number.go
+++ number.go
@@ -1,8 +1,8 @@
 package main

 import (
-       "math/rand"
        "fmt"
+       "math/rand"
 )

 func main() {

maybe this PR #170 can help.