Updates to work with tabula-java 1.0.3

[billdenney]

Please ensure the following before submitting a PR:

• [x] if suggesting code changes or improvements, open an issue first
• [x] for all but trivial changes (e.g., typo fixes), add your name to DESCRIPTION
• [x] for all but trivial changes (e.g., typo fixes), documentation your change in NEWS.md with a parenthetical reference to the issue number being addressed
• [x] if changing documentation, edit files in /R not /man and run devtools::document() to update documentation
• [x] add code or new test files to /tests for any new functionality or bug fix
• [x] make sure R CMD check runs without error before submitting the PR

This requires ropensci/tabulizerjars#6, I think. (Overall, this seemed to be pretty trivial, so I didn't add my name to the DESCRIPTION file. If you disagree, I'll update the DESCRIPTION.)