s/Travis-CI/Travis CI/g in README.md
s/Travis-CI/Travis CI/g in README.md

We do it for consistency between GitLab CI and Travis CI.

cobalt-org/cobalt.rs,cobalt-org/cobalt.rs,johannhof/cobalt.rs,leesdolphin/cobalt.rs,johannhof/cobalt.rs,johannhof/cobalt.rs,johannhof/cobalt.rs,leesdolphin/cobalt.rs,leesdolphin/cobalt.rs,cobalt-org/cobalt.rs,cobalt-org/cobalt.rs,leesdolphin/cobalt.rs