Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -24,7 +24,7 @@ doxygen:
   before_script:
     - apt-get update && apt-get install -y doxygen
   script:
-    - git clone https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/libraries
+    - git clone -b feature-aircraftGeometry2 https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/libraries
     - doxygen libraries/aircraftGeometry2/doc/Doxyfile
   rules:
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'