fix(tests): add the missing ":" to test_readme

Signed-off-by: François Magimel <francois.magimel@ovhcloud.com>

Author: Linkid

tests/test_fromfile.py

@@ -61,7 +61,7 @@ def hello():
     assert hello.__apispec__ == hello_path
 
 
-def test_readme()
+def test_readme():
     """ Test the code in the readme file """
     # Create an APISpec
     spec = APISpec(