remove node_modules after compiling bundle too

bin/endtoend-build

@@ -19,4 +19,5 @@ rm ./test/endtoend/package-lock.json
 
 cp ./test/endtoend/node_modules/uppy/dist/uppy.min.css ./test/endtoend/dist
 cp ./test/endtoend/src/index.html ./test/endtoend/dist
-browserify ./test/endtoend/src/main.js -o ./test/endtoend/dist/bundle.js -t babelify
+browserify ./test/endtoend/src/main.js -o ./test/endtoend/dist/bundle.js -t babelify
+rm -rf ./test/endtoend/node_modules