chore(pkg): new patch release (0.2.12)

• A depreciation warning related to CubicWeb-Web had been removed.
• Minimum versions of dependencies have been upgrade. We should not have problems with that for a while.

--HG-- branch : 0.2

cubicweb_jsonschema/views/y2jsl.py

@@ -199,6 +199,8 @@
     component.
     """
     def decorator(cls):
-        builder = vreg['components'].select('jsonschema.map.builder', cnx)
+        vreg_components = vreg['components']
+        builder = vreg_components.select('jsonschema.map.builder', cnx)
+        assert builder
         return builder.document(cls, schema_role)
     return decorator