Remove sha256 debug output

cmd/wasm/main.go

@@ -2,8 +2,6 @@ package main
 
 import (
 	"bytes"
-	"crypto/sha256"
-	"encoding/hex"
 	"errors"
 	"fmt"
 	"syscall/js"
@@ -104,9 +102,6 @@ func generateCover(this js.Value, args []js.Value) interface{} {
 	}
 
 	s := buf.Bytes()
-	sum := sha256.Sum256(s)
-	fmt.Println("shasum", hex.EncodeToString(sum[:]))
-
 	ta := js.Global().Get("Uint8Array").New(len(s))
 	js.CopyBytesToJS(ta, s)
 	return ta