pep8

Signed-off-by: Jess Frazelle <github@jessfraz.com>

kittycad/models/valid_source_file_format.py

@@ -1,11 +1,12 @@
 from enum import Enum
 
-class ValidSourceFileFormat(str, Enum):
-	STL = 'stl'
-	OBJ = 'obj'
-	DAE = 'dae'
-	STEP = 'step'
-	FBX = 'fbx'
 
-	def __str__(self) -> str:
-		return str(self.value)
+class ValidSourceFileFormat(str, Enum):
+    STL = 'stl'
+    OBJ = 'obj'
+    DAE = 'dae'
+    STEP = 'step'
+    FBX = 'fbx'
+
+    def __str__(self) -> str:
+        return str(self.value)