Bump minimum mlblocks version to non-dev version

Author: frances-h

setup.py

@@ -12,7 +12,7 @@
     history = history_file.read()
 
 install_requires = [
-    'mlblocks>=0.4.1.dev0,<0.5',
+    'mlblocks>=0.4.1,<0.5',
     'pandas>=1,<2',
     'numpy>=1.17.4,<1.19',
     'scipy>=1.3.3,<2',