Update labscript_utils dependency to >=3.0.0

Author: philipstarkey

setup.cfg

@@ -26,7 +26,7 @@ packages = find:
 python_requires = >=3.6
 install_requires =
   importlib_metadata
-  labscript_utils>=3.0.0rc1
+  labscript_utils>=3.0.0
   numpy>=1.15
   scipy
   matplotlib