diff --git a/changelogs/changelogs.py b/changelogs/changelogs.py
index <HASH>..<HASH> 100644
--- a/changelogs/changelogs.py
+++ b/changelogs/changelogs.py
@@ -21,7 +21,7 @@ def _load_custom_functions(vendor, name):
     :return: dict, functions
     """
     functions = {}
-    filename = "{}.py".format(name)
+    filename = "{}.py".format(name.lower())
     path = os.path.join(
         os.path.dirname(os.path.realpath(__file__)),  # current working dir
         "custom",  # /dir/parser
Make custom functions case insensitive.

Some packages prefer different kind of casing in their name. For example
`SQLAlchemy` instead of `sqlalchemy`.