重命名一些pub文件

pubspec.yaml

@@ -1,4 +1,4 @@
-name: fis_lib_qrcode
+name: fis_lib_qrflutter
 description: >
   QR.Flutter is a Flutter library for simple and fast QR code rendering via a
   Widget or custom painter.

qrcode/pubspec.yaml

@@ -1,4 +1,4 @@
-name: example
+name: fis_lib_qrcode
 description: >
   The QR.Flutter example app.
 version: 2.0.0