examples: Use cachier as cache

examples/README.md

@@ -104,14 +104,18 @@ fava`) because this still has beancount v2.3.6 pinned (if you need fava, install
 in a different venv).
 
 Also, if you want to run the example folder fully, including pdf2text extraction, 
-install the following dependencies for pdftotext:
+install the following dependencies:
 
 ```bash
+# Contains pdf2text
 apt-get install poppler-utils
+
+# Caching lib used in the example
+pip install cachier
 ```
 
 Now run beancount with the beangulp importer:
 
 ```bash
 python import.py extract ./Downloads > tmp.beancount
-```
+```

examples/importers/acme.py

@@ -13,15 +13,15 @@
 import re
 import subprocess
 
+from cachier import cachier
 from dateutil.parser import parse as parse_datetime
 
 import beangulp
 from beangulp import mimetypes
-from beangulp.cache import cache
 from beangulp.testing import main
 
 
-@cache
+@cachier()
 def pdf_to_text(filename):
     """Convert a PDF document to a text equivalent."""
     r = subprocess.run(["pdftotext", filename, "-"], stdout=subprocess.PIPE, check=True)