diff --git a/HISTORY.md b/HISTORY.md
index d0f9a26..9ab6b36 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,16 @@
 ## History / Changelog
 
 
+### 0.9.0
+
+- hardening of filters and URL parses (#14)
+- normalize punicode to unicode
+- methods added to `UrlStore`: `get_crawl_delay()`, `print_unvisited_urls()`
+- `UrlStore` now triggers exit code 1 when interrupted
+- argument added to `extract_links()`: `no_filter`
+- code refactoring: simplifications
+
+
 ### 0.8.3
 
 - fixed bug in domain name extraction
diff --git a/README.rst b/README.rst
index 67a52b6..e55f986 100644
--- a/README.rst
+++ b/README.rst
@@ -254,6 +254,7 @@ The ``UrlStore`` class allow for storing and retrieving domain-classified URLs,
    - ``add_urls(urls=[], appendleft=None, visited=False)``: Add a list of URLs to the (possibly) existing one. Optional: append certain URLs to the left, specify if the URLs have already been visited.
    - ``dump_urls()``: Return a list of all known URLs.
    - ``print_urls()``: Print all URLs in store (URL + TAB + visited or not).
+   - ``print_unvisited_urls()``: Print all unvisited URLs in store.
    - ``get_known_domains()``: Return all known domains as a list.
    - ``total_url_number()``: Find number of all URLs in store.
    - ``is_known(url)``: Check if the given URL has already been stored.
@@ -265,6 +266,7 @@ The ``UrlStore`` class allow for storing and retrieving domain-classified URLs,
 - Crawling and downloads
    - ``get_url(domain)``: Retrieve a single URL and consider it to be visited (with corresponding timestamp).
    - ``get_rules(domain)``: Return the stored crawling rules for the given website.
+   - ``get_crawl_delay()``: Return the delay as extracted from robots.txt, or a given default.
    - ``get_download_urls(timelimit=10)``: Get a list of immediately downloadable URLs according to the given time limit per domain.
    - ``establish_download_schedule(max_urls=100, time_limit=10)``: Get up to the specified number of URLs along with a suitable backoff schedule (in seconds).
    - ``download_threshold_reached(threshold)``: Find out if the download limit (in seconds) has been reached for one of the websites in store.
diff --git a/courlan/__init__.py b/courlan/__init__.py
index ef6c125..c0836e5 100644
--- a/courlan/__init__.py
+++ b/courlan/__init__.py
@@ -7,8 +7,8 @@
 __title__ = "courlan"
 __author__ = "Adrien Barbaresi"
 __license__ = "GNU GPL v3+"
-__copyright__ = "Copyright 2020-2022, Adrien Barbaresi"
-__version__ = "0.8.3"
+__copyright__ = "Copyright 2020-2023, Adrien Barbaresi"
+__version__ = "0.9.0"
 
 
 # imports
diff --git a/courlan/clean.py b/courlan/clean.py
index 2059c7b..abfe5e7 100644
--- a/courlan/clean.py
+++ b/courlan/clean.py
@@ -9,7 +9,7 @@
 import re
 
 from typing import Optional, Union
-from urllib.parse import parse_qs, urlencode, urlparse, ParseResult
+from urllib.parse import parse_qs, urlencode, ParseResult
 
 from .filters import validate_url
 from .settings import ALLOWED_PARAMS, CONTROL_PARAMS, TARGET_LANG_DE, TARGET_LANG_EN
diff --git a/courlan/langinfo.py b/courlan/langinfo.py
index d08f796..93ae42b 100644
--- a/courlan/langinfo.py
+++ b/courlan/langinfo.py
@@ -2,8 +2,10 @@
 Constants containing info about languages and countries.
 """
 
+from typing import Set
 
-LANGUAGE_CODES = {
+
+LANGUAGE_CODES: Set[str] = {
     "aa",
     "ab",
     "ae",
@@ -191,7 +193,7 @@
 }
 
 
-COUNTRY_CODES = {
+COUNTRY_CODES: Set[str] = {
     "aw",
     "af",
     "ao",
diff --git a/setup.py b/setup.py
index 27f8dcb..b3efa61 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 
 def get_version(package):
     "Return package version as listed in `__version__` in `init.py`"
-    initfile = Path(package, '__init__.py').read_text()  # Python >= 3.5
+    initfile = Path(package, "__init__.py").read_text(encoding="utf-8")
     return re.search("__version__ = ['\"]([^'\"]+)['\"]", initfile)[1]
 
 
@@ -38,6 +38,7 @@ def get_long_description():
             "courlan/clean.py",
             "courlan/core.py",
             "courlan/filters.py",
+            "courlan/langinfo.py",
             "courlan/settings.py",
             "courlan/urlstore.py",
             "courlan/urlutils.py",
@@ -105,7 +106,8 @@ def get_long_description():
     python_requires=">=3.6",
     install_requires=[
         "langcodes >= 3.3.0",
-        "tld >= 0.12.6",
+        "tld == 0.12.6; python_version < '3.7'",
+        "tld >= 0.13; python_version >= '3.7'",
         "urllib3 >= 1.26, < 2",
     ],
     # extras_require=extras,