[PR #321] Use firefox instead of chrome for pull request unit testing

Author: lbustelo

Makefile

@@ -226,7 +226,7 @@ ifdef SAUCE_USER_NAME
 	@echo 'Running web component tests remotely on Sauce Labs...'
 	@npm run test-sauce --silent -- --sauce-tunnel-id \"$(TRAVIS_JOB_NUMBER)\" --sauce-username $(SAUCE_USER_NAME) --sauce-access-key $(SAUCE_ACCESS_KEY)
 else
-	@npm run test -- --local chrome
+	@npm run test -- --local firefox
 endif
 
 test-py: dist/urth
@@ -379,4 +379,4 @@ all: init
 release: EXTRA_OPTIONS=-e PYPI_USER=$(PYPI_USER) -e PYPI_PASSWORD=$(PYPI_PASSWORD)
 release: PRE_SDIST=echo "[server-login]" > ~/.pypirc; echo "username:" ${PYPI_USER} >> ~/.pypirc; echo "password:" ${PYPI_PASSWORD} >> ~/.pypirc;
 release: POST_SDIST=register upload
-release: sdist
+release: sdist