Update vendor

vendor/github.com/valyala/fasttemplate/unsafe.go

@@ -0,0 +1,20 @@
+package fasttemplate
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+func unsafeBytes2String(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}
+
+func unsafeString2Bytes(s string) []byte {
+	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
+	bh := reflect.SliceHeader{
+		Data: sh.Data,
+		Len:  sh.Len,
+		Cap:  sh.Len,
+	}
+	return *(*[]byte)(unsafe.Pointer(&bh))
+}