Merge pull request #147 from LukeParky/fix-dockerfile-test-link

Update broken Dockerfile.test link

README.md

@@ -52,7 +52,7 @@ root         1  0.0  0.0   7140   768 ?        Rs+  02:22   0:00 ps aux
 
 Additionally, due to the fact that `gosu` is using Docker's own code for processing these `user:group`, it has exact 1:1 parity with Docker's own `--user` flag.
 
-If you're curious about the edge cases that `gosu` handles, see [`Dockerfile.test`](Dockerfile.test) for the "test suite" (and the associated [`test.sh`](test.sh) script that wraps this up for testing arbitrary binaries).
+If you're curious about the edge cases that `gosu` handles, see [`Dockerfile.test-alpine`](Dockerfile.test-alpine) for the "test suite" (and the associated [`test.sh`](test.sh) script that wraps this up for testing arbitrary binaries).
 
 (Note that `sudo` has different goals from this project, and it is *not* intended to be a `sudo` replacement; for example, see [this Stack Overflow answer](https://stackoverflow.com/a/48105623) for a short explanation of why `sudo` does `fork`+`exec` instead of just `exec`.)