message: Don't use features of Qt 5.6 in the integration test yet
diff: @@ -382,7 +382,10 @@ class ZNCTest : public testing::Test {
  ASSERT_TRUE(file.open(QIODevice::WriteOnly | QIODevice::Text));
  QTextStream out(&file);
  for (const QString& line : lines) {
  - out << line.midRef(maxoffset) << "\n";
  + // QTextStream::operator<<(const QStringRef &string) was
  + // introduced in Qt 5.6; let's keep minimum required version
  + // less than that for now.
  + out << line.mid(maxoffset) << "\n";
  }
  } else {
  // Write as is
  