Update pyproject.toml

Author: molinav

packages/basemap/pyproject.toml

@@ -1,9 +1,11 @@
 [build-system]
 requires = [
-    "setuptools", "wheel",
+    'setuptools',
+    'wheel',
     'oldest-supported-numpy; python_version >= "3.5"',
-    'numpy==1.16.6; python_version == "3.4" or python_version == "2.7"',
+    'numpy == 1.16.6; python_version == "3.4" or python_version == "2.7"',
     'numpy == 1.11.3; python_version == "3.3" or python_version == "3.2" or python_version == "2.6"',
-    'cython >= 0.29, <3.1; python_version >= "3.5"'
+    'cython >= 0.29, < 3.1; python_version >= "3.3" or python_version <= "3.0"',
+    'cython >= 0.26, < 0.27; python_version == "3.2"'
 ]
 build-backend = "setuptools.build_meta"