fix more URLs

Author: lorenzwalthert

vignettes/why-use-hooks.Rmd

@@ -75,7 +75,7 @@ code in other CI services to perform these tasks:
     for the maintainers of {precommit}.
 
 -   **Independent.** pre-commit is not bound to GitHub, but runs on your
-    local computer upon commit, and [pre-commit.ci](pre-commit.ci) will
+    local computer upon commit, and [pre-commit.ci](https://pre-commit.ci) will
     support on other git hosts than GitHub in the future.
 
 Have an idea for a hook? Please [file an