Update __init__.py

add dot

Author: Faezehabibi

ngclearn/modules/regression/__init__.py

@@ -1,6 +1,6 @@
-from elastic_net import Iterative_ElasticNet
-from lasso import Iterative_Lasso
-from ridge import Iterative_Ridge
+from .elastic_net import Iterative_ElasticNet
+from .lasso import Iterative_Lasso
+from .ridge import Iterative_Ridge