Fix minor typos in the README (jazzband#1814)

`dependant` -> `dependent`

README.rst

@@ -539,8 +539,8 @@ needed, the same way it would be done for regular ``pip`` cross-environment usag
 
 If the generated ``requirements.txt`` remains exactly the same for all Python
 environments, then it can be used across Python environments safely. **But** users
-should be careful as any package update can introduce environment-dependant
-dependencies, making any newly generated ``requirements.txt`` environment-dependant too.
+should be careful as any package update can introduce environment-dependent
+dependencies, making any newly generated ``requirements.txt`` environment-dependent too.
 As a general rule, it's advised that users should still always execute ``pip-compile``
 on each targeted Python environment to avoid issues.