Update version to 1.2.15

Author: SimonLuo

setup.py

@@ -14,7 +14,7 @@
 
 setup(
     name='qingcloud-sdk',
-    version='1.2.14',
+    version='1.2.15',
     description='Software Development Kit for QingCloud.',
     long_description=open('README.rst', 'rb').read().decode('utf-8'),
     keywords='qingcloud iaas qingstor sdk',