use TRAVIS_PULL_REQUEST_SHA if present

Author: mr-c

Makefile

@@ -56,7 +56,7 @@ install: FORCE
 dist: dist/${MODULE}-$(VERSION).tar.gz
 
 dist/${MODULE}-$(VERSION).tar.gz: $(SOURCES)
-	./setup.py sdist bdist-wheel
+	./setup.py sdist bdist_wheel
 
 ## clean       : clean up all temporary / machine-generated files
 clean: FORCE

release-test.sh

@@ -11,7 +11,7 @@ pipver=7.0.2 # minimum required version of pip
 
 rm -Rf testenv? || /bin/true
 
-export HEAD=`git rev-parse HEAD`
+export HEAD=${TRAVIS_PULL_REQUEST_SHA:-$(git rev-parse HEAD)}
 
 if [ "${RELEASE_SKIP}" != "head" ]
 then