chore: Run pyupgrade

setup.py

@@ -1,4 +1,3 @@
-# coding: utf-8
 from setuptools import find_packages, setup
 
 install_requires = ["requests>=2.20.0"]

src/postmarker/core.py

@@ -75,7 +75,7 @@ def from_config(cls, config, prefix="postmark_", is_uppercase=False):
         return cls(**kwargs)
 
     def __repr__(self):
-        return "<{}: {}>".format(self.__class__.__name__, self.server_token)
+        return f"<{self.__class__.__name__}: {self.server_token}>"
 
     def _setup_managers(self):
         """Allows to access manager by model name.

src/postmarker/models/messages.py

@@ -177,7 +177,7 @@ def __str__(self):
         return self.Name
 
     def __repr__(self):
-        return "<{}: {}>".format(self.__class__.__name__, self)
+        return f"<{self.__class__.__name__}: {self}>"
 
     def __len__(self):
         return self.ContentLength