Updated install requirement to 3.0.0rc1+

Author: philipstarkey

setup.cfg

@@ -26,7 +26,7 @@ packages = find:
 python_requires = >=3.6
 install_requires =
   importlib_metadata
-  labscript_utils>=2.14.0
+  labscript_utils>=3.0.0rc1
   numpy>=1.15
   scipy
   matplotlib
@@ -38,4 +38,3 @@ docs =
   sphinx-rtd-theme==0.4.3
   recommonmark==0.6.0
   m2r==0.2.1
-  labscript_utils>=2.14.0dev0