Update api spec (#107)

* YOYO NEW API SPEC!

* I have generated the latest API!

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kittycad/models/axis.py

@@ -0,0 +1,17 @@
+from enum import Enum
+
+
+class Axis(str, Enum):
+    """Co-ordinate axis specifier.
+
+    See [cglearn.eu] for background reading.
+
+    [cglearn.eu]: https://cglearn.eu/pub/computer-graphics/introduction-to-geometry#material-coordinate-systems-1"""  # noqa: E501
+
+    """# 'Y' axis. """  # noqa: E501
+    Y = "y"
+    """# 'Z' axis. """  # noqa: E501
+    Z = "z"
+
+    def __str__(self) -> str:
+        return str(self.value)