Add .travis.yml.
Add .travis.yml.

tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby,tree-sitter/tree-sitter-ruby