message: Update README.md
  swapped for better gasket material
diff: @@ -38,14 +38,14 @@ We may have parts to send you from our inventory.
  | 3 | 1 | Roomba | Filter | $8/6pk | [Z][3amzn] | removed from filter unit as delivered |
  | 4 | 1 | RespiraWorks | Filter Inner Gasket | $0.10 (material) | B | make using item 6 below |
  | 5 | 1 | RespiraWorks | Filter Outer Gasket | $0.10 (material) | B | make using item 6 below |
  -| 6 | ~4 sq in | Amazon | Gasket Material | $0.10 (material) | [Z][6amzn] | cut with jigs to make items 4 and 5 |
  +| 6 | ~4 sq in | McMaster-Carr | Gasket Material | $22.22/ 12x12" sheet | [C][9mcmc] | cut with jigs to make items 4 and 5 |
  | 7 | 2 | McMaster-Carr | 96016A556 | $5.50/10pk | [C][7mcmc] | thumbscrews |
  | 8 | 2 | McMaster-Carr | 94180A333 | $16.69/100pk | [C][8mcmc] | thumbscrews |
  [1rw]: assets/SmallFilterHousing.stl
  [2rw]: assets/SmallFilterPatientConnector.stl
  [3amzn]: https://www.amazon.com/gp/product/B01KNZCW8E
  -[6amzn]: https://www.amazon.com/gp/product/B07BKP6KFX
  +[9mcmc]: https://www.mcmaster.com/8785K82-8785K822/
  [7mcmc]: https://www.mcmaster.com/96016A556-96016A831/
  [8mcmc]: https://www.mcmaster.com/94180A333/
  