hamster wheel: types.ModuleType() instead of module_from_spec()

Based on the python3 docs for imp.new_module(), I blindly transliterated
imp.new_module() to importlib.util.module_from_spec(). But that doesn't
work.

ref: https://stackoverflow.com/a/32175781

Author: justinmk

pynvim/plugin/script_host.py

@@ -1,5 +1,6 @@
 """Legacy python/python3-vim emulation."""
 try:
+    import types
     import importlib
 except ImportError:
     import imp
@@ -41,7 +42,7 @@ def __init__(self, nvim):
         self.setup(nvim)
         # context where all code will run
         if IS_PYTHON3_7:
-            self.module = importlib.util.module_from_spec('__main__')
+            self.module = types.ModuleType('__main__')
         else:
             self.module = imp.new_module('__main__')
         nvim.script_context = self.module