Move to pyproject.toml for installation. (#62)

* Deleted setup.py, all configuration now in setup.cfg which pyproject.toml points to.

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools>=61.0.0"]
+build-backend = "setuptools.build_meta"

setup.cfg

@@ -0,0 +1,31 @@
+[metadata]
+license_files = LICENSE
+name = pydarnio
+version = 1.2.1
+author = SuperDARN
+long_description = file: README.md
+long_description_content_type = text/markdown
+description = Python library for reading and writing SuperDARN data
+url = https://pydarnio.readthedocs.io/en/latest/
+classifiers =
+    Development Status :: 5 - Production/Stable
+    License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+
+[options]
+python_requires = >=3.6
+include_package_data = True
+install_requires =
+    pyyaml
+    numpy
+    h5py>=3.3.0
+    deepdish
+    pathlib2
+
+[options.packages.find]
+exclude =
+    test*
+    test_files*
+    docs*
+    build*