Update link and fix typo in README.md

The link in the README file's "bleeding edge" reference has been updated to accurately direct users to the relevant blog post. Also corrected the typo by capitalizing the initial letter of the sentence.

Author: o0h

README.md

@@ -22,7 +22,7 @@ It also contains this strict framework-specific rules (can be enabled separately
 * Check that you are not using `assertSame()` with `false` as expected value. `assertFalse()` should be used instead.
 * Check that you are not using `assertSame()` with `null` as expected value. `assertNull()` should be used instead.
 * Check that you are not using `assertSame()` with `count($variable)` as second parameter. `assertCount($variable)` should be used instead.
-  * if you enable [bleedingEdge](/blog/what-is-bleeding-edge), check that you are not using `assertSame()` with `count($variable)` as first and second parameter. `assertSameSize()`should be used instead.
+  * If you enable [bleeding edge](https://phpstan.org/blog/what-is-bleeding-edge), check that you are not using `assertSame()` with `count($variable)` as first and second parameter. `assertSameSize()`should be used instead.
 
 ## How to document mock objects in phpDocs?