Correcting link to CI file in readme

HOW_BUILD_WORKS.md

@@ -2,7 +2,7 @@
 
 T-Coffee is automatically build by using the [Circle CI](https://circleci.com/gh/cbcrg/tcoffee) service.
 
-The Circle build is controlled by the [.circleci/circle.yml](circle.yml) file. 
+The Circle build is controlled by the [circle.yml](.circleci/circle.yml) file. 
 
 ## Build process main tasks 
 
@@ -23,4 +23,4 @@ The Circle build is controlled by the [.circleci/circle.yml](circle.yml) file.
   with the names `cbcrg/tcoffee:latest` and `cbcrg/tcoffee:<version.commit-id>`
 
 7. The environment variable `RELEASE=0|1` is used to mark the build as beta or stable 
-  (use the [build/make_release.sh] to trigger a new release build).
+  (use the [build/make_release.sh] to trigger a new release build).