push to docker in after_success step

.travis.yml

@@ -6,6 +6,7 @@ before_install:
 - make build
 script:
 - make test
+after_success:
 - make travis_push
 
 env:

README.md

@@ -1 +1,4 @@
 # docker-doxygen
+
+    cd /path/to/source
+    docker run --rm -v $(pwd):/data -it cwpearson/doxygen doxygen