[dependency] update python-stdnum dependency to the newest release

Change-Id: Ib6c1534975d124e24a0b987eb72eaecc5285e1b2
---
M setup.py
M requirements.txt
2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/requirements.txt b/requirements.txt
index c4bc403..67bdf87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,7 +39,7 @@
 pydot >= 1.4.1
 
 # cosmetic_changes
-python-stdnum >= 1.17
+python-stdnum >= 1.18
 
 # GUI
 Pillow >= 8.1.1
diff --git a/setup.py b/setup.py
index b15942f..e817c72 100755
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,7 @@
 extra_deps = {
     # Core library dependencies
     'eventstreams': ['sseclient<0.0.23,>=0.0.18'],  # T222885
-    'isbn': ['python-stdnum>=1.17'],
+    'isbn': ['python-stdnum>=1.18'],
     'Graphviz': ['pydot>=1.4.1'],
     'Google': ['google>=1.7'],
     'memento': ['memento_client==0.6.1'],

