DOC: Move standard sections to the top

Standard sections should be defined before tool specific sections,
`poetry init` generated this order by default and I haven't fixed
 it until now.

Author: Kai-Striega

pyproject.toml

@@ -1,3 +1,8 @@
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+
 [tool.poetry]
 name = "numpy-financial"
 version = "1.1.0.dev0"
@@ -48,8 +53,3 @@ numpydoc = "^1.5"
 
 [tool.poetry.group.lint.dependencies]
 flake8 = "*"
-
-
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"