Update .travis.yml

Author: SimonDanisch

.travis.yml

@@ -8,4 +8,5 @@ julia:
 notifications:
   email: false
 after_success:
-- julia -e 'cd(Pkg.dir("FileIO")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(Coveralls.process_folder()); Codecov.submit(process_folder())'
+- julia -e 'cd(Pkg.dir("MeshIO")); Pkg.add("Coverage"); Pkg.checkout("Coverage"); Pkg.checkout("Requests")'
+- julia -e 'using Coverage; Coveralls.submit(Coveralls.process_folder()); Codecov.submit(process_folder())'