Update README.md and User Docs with revised link to rspec differ (#276)

The current link to the rspec differ points to an archived repo. This link points to the latest rspec support git tag (`rspec-support-3.13.2`).

Co-authored-by: Joe Stein <[email protected]>

Author: sealocal

Diff for: CHANGELOG.md

@@ -20,6 +20,7 @@
 ### Other changes
 
 - Fix `logger` dependency issues in CI. [#277](https://github.com/splitwise/super_diff/pull/277)
+- Updated permalink to rspec differ in README.md [#258](https://github.com/splitwise/super_diff/pull/276) by [@sealocal](https://github.com/sealocal)
 
 ## 0.15.0 - 2025-01-06
 

Diff for: README.md

@@ -28,7 +28,7 @@ Since [RSpec merely runs your `expected` and `actual` values through Ruby's Pret
 and then performs a diff of these strings,
 the output it produces leaves much to be desired.
 
-[rspec-differ-fail]: https://github.com/rspec/rspec-support/blob/c69a231d7369dd165ad7ce4742e1a2e21e3462b5/lib/rspec/support/differ.rb#L178
+[rspec-differ-fail]: https://github.com/rspec/rspec/blob/rspec-support-v3.13.2/rspec-support/lib/rspec/support/differ.rb#L180-L192
 
 For instance, let's say you wanted to compare these two hashes:
 

Diff for: docs/users/index.md

@@ -16,7 +16,7 @@ Since [RSpec merely runs your `expected` and `actual` values through Ruby's Pret
 and then performs a diff of these strings,
 the output it produces leaves much to be desired.
 
-[rspec-differ-fail]: https://github.com/rspec/rspec-support/blob/c69a231d7369dd165ad7ce4742e1a2e21e3462b5/lib/rspec/support/differ.rb#L178
+[rspec-differ-fail]: https://github.com/rspec/rspec/blob/rspec-support-v3.13.2/rspec-support/lib/rspec/support/differ.rb#L180-L192
 
 For instance, let's say you wanted to compare these two hashes: