update travis.yaml

Author: yuji38kwmt

.travis.yml

@@ -6,7 +6,7 @@ python:
   - "3.8"
 install:
   - pip install . flake8 mypy pylint pytest
-  - echo -e "machine annofab.com\nlogin FOO\npassword BAR\n" > ~/.netrc
+  - echo -e "machine annofab.com\nlogin FOO\npassword BAR\n" > ~/.netrc && chmod 600 ~/.netrc
 script:
    - flake8 annofabapi
    - mypy annofabapi --config-file setup.cfg