Update version to 11.9.7

Author: python273

setup.py

@@ -11,7 +11,7 @@
 """
 
 
-version = '11.9.6'
+version = '11.9.7'
 
 with open('README.md', encoding='utf-8') as f:
     long_description = f.read()

vk_api/__init__.py

@@ -14,5 +14,5 @@
 
 
 __author__ = 'python273'
-__version__ = '11.9.6'
+__version__ = '11.9.7'
 __email__ = 'vk_api@python273.pw'

vk_api/vk_api.py

@@ -43,7 +43,10 @@
 
 
 def get_unknown_exc_str(s):
-    return 'Unknown error ({}). Please send bugreport to GitHub or vk_api@python273.pw'.format(s)
+    return (
+        f'Unknown error ({s}). Please send a bugreport to GitHub: '
+        'https://github.com/python273/vk_api/issues'
+    )
 
 
 class VkApi(object):