WIP: specify requires versions and build backend

Also use __file__ to determine path

Author: agoose77

pyproject.toml

@@ -1,3 +1,3 @@
 [build-system]
-# Minimum requirements for the build system to execute.
-requires = ["setuptools", "wheel", "jupyterlab==3.*"]
+requires = ["jupyterlab>=3.0.0", "setuptools>=40.8.0", "wheel"]
+build-backend = "setuptools.build_meta"

setup.py

@@ -24,7 +24,7 @@
 
 LONG_DESCRIPTION = 'A Python/ThreeJS bridge utilizing the Jupyter widget infrastructure.'
 
-here = os.path.abspath(os.path.dirname(sys.argv[0]))
+here = os.path.dirname(os.path.abspath(__file__))
 name = 'pythreejs'
 version = get_version(os.path.join(here, name, '_version.py'))