Readme update and change SHA1 to SHA512

Signed-off-by: faizanahmad055 <faizan.ahmad55@outlook.com>

internal/pkg/crypto/sha.go

@@ -1,20 +1,16 @@
 package crypto
 
 import (
-	"crypto/sha1"
-	"fmt"
-	"io"
-
-	"github.com/sirupsen/logrus"
+	"crypto/sha512"
+	"encoding/hex"
 )
 
 // GenerateSHA generates SHA from string
 func GenerateSHA(data string) string {
-	hasher := sha1.New()
-	_, err := io.WriteString(hasher, data)
-	if err != nil {
-		logrus.Errorf("Unable to write data in hash writer %v", err)
+	if data == "" {
+		return ""
 	}
-	sha := hasher.Sum(nil)
-	return fmt.Sprintf("%x", sha)
+
+	hash := sha512.Sum512_256([]byte(data))
+	return hex.EncodeToString(hash[:])
 }