Remove empty sha256 field from source URL in meta.yaml

Author: rbeucher

.conda/meta.yaml

@@ -7,7 +7,6 @@ package:
 
 source:
     url: "https://files.pythonhosted.org/packages/source/a/access_mopper/access_mopper-{{ version }}.tar.gz"
-    sha256: ""  # This will be filled automatically by conda-build when using --croot or can be left empty for latest
 
 build:
     noarch: python