Fix remaining NIST Special Publication 811 links.

Resolves #471.

Author: iliekturtles

CONTRIBUTING.md

@@ -22,4 +22,4 @@ at your option.
 [BIPM]: https://www.bipm.org/en/about-us/
 [brochure]: https://www.bipm.org/en/publications/si-brochure/
 [si]: https://jcgm.bipm.org/vim/en/1.16.html
-[nist811]: https://www.nist.gov/pml/nist-guide-si-appendix-b9-factors-units-listed-kind-quantity-or-field-science
+[nist811]: https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9

src/lib.rs

@@ -150,7 +150,7 @@
 //! [BIPM]: https://www.bipm.org/en/about-us/
 //! [brochure]: https://www.bipm.org/en/publications/si-brochure/
 //! [si]: https://jcgm.bipm.org/vim/en/1.16.html
-//! [nist811]: https://www.nist.gov/pml/nist-guide-si-appendix-b9-factors-units-listed-kind-quantity-or-field-science
+//! [nist811]: https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9
 
 // Compile with `no_std` when the `std` feature is not specified.
 #![cfg_attr(not(feature = "std"), no_std)]

uom-macros/CONTRIBUTING.md

@@ -22,4 +22,4 @@ at your option.
 [BIPM]: https://www.bipm.org/en/about-us/
 [brochure]: https://www.bipm.org/en/publications/si-brochure/
 [si]: https://jcgm.bipm.org/vim/en/1.16.html
-[nist811]: https://www.nist.gov/pml/nist-guide-si-appendix-b9-factors-units-listed-kind-quantity-or-field-science
+[nist811]: https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9

uom-macros/README.md

@@ -37,5 +37,4 @@ at your option.
 [BIPM]: https://www.bipm.org/en/about-us/
 [brochure]: https://www.bipm.org/en/publications/si-brochure/
 [si]: https://jcgm.bipm.org/vim/en/1.16.html
-[nist811]: https://www.nist.gov/pml/nist-guide-si-appendix-b9-factors-units-listed-kind-quantity-or-field-science
-
+[nist811]: https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9