Delete token.Int() (#312)

Not used anywhere.

token.go

@@ -2,7 +2,6 @@ package toml
 
 import (
 	"fmt"
-	"strconv"
 	"unicode"
 )
 
@@ -95,14 +94,6 @@ func (tt tokenType) String() string {
 	return "Unknown"
 }
 
-func (t token) Int() int {
-	if result, err := strconv.Atoi(t.val); err != nil {
-		panic(err)
-	} else {
-		return result
-	}
-}
-
 func (t token) String() string {
 	switch t.typ {
 	case tokenEOF: