fix code style

src/pystencils/include/__main__.py

 import argparse
 
+
 def main():
-    parser = argparse.ArgumentParser("Print the include path for the pystencils runtime headers")
-    parser.add_argument("-I", dest="dash_i", action="store_true", help="Emit as `-I` compiler argument")
-    parser.add_argument("-s", dest="strip", action="store_true", help="Emit without trailing newline")
+    parser = argparse.ArgumentParser(
+        "Print the include path for the pystencils runtime headers"
+    )
+    parser.add_argument(
+        "-I", dest="dash_i", action="store_true", help="Emit as `-I` compiler argument"
+    )
+    parser.add_argument(
+        "-s", dest="strip", action="store_true", help="Emit without trailing newline"
+    )
     args = parser.parse_args()
 
     from . import get_pystencils_include_path
+
     include_path = get_pystencils_include_path()
 
     if args.dash_i:
@@ -15,4 +23,5 @@ def main():
         end = "" if args.strip else "\n"
         print(get_pystencils_include_path(), end=end)
 
+
 main()