.travis.yml: Add md2html to coveralls upload.
diff --git a/.travis.yml b/.travis.yml
index 1ac50db..4efe09b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,4 +18,4 @@ after_success:
- sudo apt-get install python3
- pip install --user cpp-coveralls
- ../scripts/run-tests.sh
- - ~/.local/bin/coveralls -r .. -i md4c
+ - ~/.local/bin/coveralls -r .. --gcov-options '\-lp' -i md4c -i md2html