Upgrade Python syntax with pyupgrade

pylast/__init__.py

@@ -1018,11 +1018,11 @@ class SessionKeyGenerator(object):
 
         token = self._get_web_auth_token()
 
-        url = "%(homepage)s/api/auth/?api_key=%(api)s&token=%(token)s" % {
-            "homepage": self.network.homepage,
-            "api": self.network.api_key,
-            "token": token,
-        }
+        url = "{homepage}/api/auth/?api_key={api}&token={token}".format(
+            homepage=self.network.homepage,
+            api=self.network.api_key,
+            token=token,
+        )
 
         self.web_auth_tokens[url] = token