Fix wrong estimation of code in go

[ASH-WIN-10]

Tokei was detecting a "/*" in a multiline string "``" as a comment in go.
This makes the rest of the code as a comment too resulting in wrong code and comment count.

Adding multiline string quotes "``" in the 'languages.json' file fixes this.

Example:

package main

import "fmt"

func main() {
    s := `/*`
    fmt.Println(s);
}

This resulted in the code count being only 4 lines and comments count being 2 even when there are no comments.

This is the output tokei gave before the change:

This is the output tokei gave after the change:

[ASH-WIN-10]

also fixes the issue #1113

tokei was showing more code count because it considered the '"' in "``" as the start of the string.

Example:

package main

import "fmt"

func main() {
    s := `"`  // this would be considered as a the start of a string making the rest of the lines be considered as code even though there are some comments in it
    // comment
    //
    fmt.Println(s);
}