dependencies update

README.rst

@@ -44,6 +44,8 @@ Requirements
 For example, you might want to mention here which versions of CKAN this
 extension works with.
 
+pip install -r dev-requirements.txt
+
 The configuration variable ``ckanext.ozwillo_theme.plugin.ozwillo_url`` must be
 set(for example to https://ozwillo-preprod.eu)
 

dev-requirements.txt

@@ -0,0 +1 @@
+python-slugify

setup.py

@@ -58,7 +58,7 @@ setup(
     # project is installed. For an analysis of "install_requires" vs pip's
     # requirements files see:
     # https://packaging.python.org/en/latest/technical.html#install-requires-vs-requirements-files
-    install_requires=[],
+    install_requires=['python-slugify'],
 
     # If there are data files included in your packages that need to be
     # installed, specify them here.  If using Python 2.6 or less, then these