Bump version to 1.4.0

Author: carloalbertobarbano

setup.py

@@ -6,7 +6,7 @@
 
 setup(
     name='torchstain',
-    version='1.3.0',
+    version='1.4.0',
     description='Stain normalization tools for histological analysis and computational pathology',
     long_description=README,
     long_description_content_type='text/markdown',