[MNT] Update maintenance tools

Author: xuyxu

.codecov.yml

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+# PR status check
+coverage:
+  status:
+    project:
+      default:
+        # treshold: 1%
+        informational: true
+    patch:
+      default:
+        informational: true
+
+# post coverage report as comment on PR
+comment: false
+
+# enable codecov to report to GitHub status checks
+github_checks:
+  annotations: false

.gitignore

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+*.pyc
+*.dat
+*.c
+*.pyd
+*.so
+*.mmap
+*.tgn
+*.pkl
+*.est
+*.clf
+*.html
+*.xml
+.coverage
+
+.DS_Store
+.idea/
+.vscode/
+.pytest_cache/
+build/
+_build/
+dist/
+deepforest.egg-info/
+benchmarks/*.txt
+benchmarks/logs
+cache/
+tmp/

.readthedocs.yml

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+version: 2
+
+formats: all
+
+sphinx:
+  configuration: docs/conf.py
+
+python:
+  version: 3.7
+  install:
+    - requirements: docs/requirements.txt
+

docs/requirements.txt

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+sphinx==3.1.2
+sphinx_rtd_theme==0.5.0
+sphinx-copybutton==0.3.1

pyproject.toml

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+[build-system]
+# Minimum requirements for the build system to execute.
+# Modified from https://github.com/scikit-learn/scikit-learn/blob/main/pyproject.toml
+requires = [
+    "setuptools",
+    "wheel",
+    "Cython>=0.28.5",
+
+    # PyPy needs numpy >= 1.14.0
+    # platform_python_implementation!='CPython' not needed >= Python 3.7 which is numpy 1.14.5
+    "numpy==1.13.3; python_version=='3.6' and platform_machine!='aarch64' and platform_system!='AIX' and platform_python_implementation=='CPython'",
+    "numpy==1.14.0; python_version=='3.6' and platform_machine!='aarch64' and platform_system!='AIX' and platform_python_implementation!='CPython'",
+
+    # AIX needs numpy >= 1.16.0
+    # platform_system!='AIX' not needed >= Python 3.8 which is numpy 1.17.3
+    "numpy==1.16.0; python_version=='3.6' and platform_machine!='aarch64' and platform_system=='AIX'",
+    "numpy==1.16.0; python_version=='3.7' and platform_machine!='aarch64' and platform_system=='AIX'",
+
+    # ARM needs numpy >= 1.19.0
+    # platform_machine!='aarch64' not needed >= Python 3.9 which is numpy 1.19.3
+    "numpy==1.19.0; python_version=='3.6' and platform_machine=='aarch64'",
+    "numpy==1.19.0; python_version=='3.7' and platform_machine=='aarch64'",
+    "numpy==1.19.0; python_version=='3.8' and platform_machine=='aarch64'",
+
+    # default numpy requirements
+    "numpy==1.14.5; python_version=='3.7' and platform_machine!='aarch64' and platform_system!='AIX'",
+    "numpy==1.17.3; python_version=='3.8' and platform_machine!='aarch64'",
+
+    "scipy>=0.19.1",
+]

requirements.txt

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+numpy>=1.13.3
+scipy>=0.19.1
+joblib>=0.11
+scikit-learn>=0.22