type constrait syntax error

[carlosandrefernandes]

//fixing syntax error on numeric.go (ch13) line 8: package main

import ( "fmt" )

type Numeric interface { int | int8 | int16 | int32 | int64 | float64 }

func Add[T Numeric](a, b T) T { return a + b }

func main() { fmt.Println("4 + 3 =", Add(4,3)) fmt.Println("4.1 + 3.2 =", Add(4.1,3.2)) }

[mactsouk]

@carlosandrefernandes Please open a pull request with the changes so I can test them. Thanks!