Fixing travis

.travis.yml

@@ -12,8 +12,8 @@ addons:
 script:
   - sudo ln -s /usr/bin/gcc-6 /usr/local/bin/gcc
   - export CC=gcc-7
-  - make -C ./tests
-  - make -C ./main
-  - make -C ./codecov
+  - make -C ./tests/
+  - make -C ./tests/main/
+  - make -C ./tests/codecov/
 after_success:
   - bash <(curl -s https://codecov.io/bash)