Update example data and prepare patch release (#132)

Author: OriolAbril

src/arviz_base/_version.py

@@ -1,3 +1,3 @@
 """Base ArviZ version."""
 
-__version__ = "0.9.0.dev0"
+__version__ = "0.8.1"

src/arviz_base/datasets.py

@@ -148,7 +148,7 @@ def load_arviz_data(dataset=None, data_home=None, **kwargs):
         if remote.checksum != checksum:
             raise OSError(
                 f"{file_path} has an SHA256 checksum ({checksum}) differing from expected "
-                "({remote.checksum}), file may be corrupted. "
+                f"({remote.checksum}), file may be corrupted. "
                 "Run `arviz.clear_data_home()` and try again, or please open an issue."
             )