update to minimally required version of pip

Author: mr-c

release-test.sh

@@ -7,6 +7,7 @@ package=schema-salad
 module=schema_salad
 repo=https://github.com/common-workflow-language/schema_salad.git
 run_tests="py.test --pyarg ${module}"
+pipver=6.0 # minimum required version of pip
 
 rm -Rf testenv? || /bin/true
 
@@ -19,7 +20,7 @@ virtualenv testenv4
 # First we test the head
 source testenv1/bin/activate
 rm testenv1/lib/python-wheels/setuptools* \
-	&& pip install --force-reinstall -U pip==1.5.6 \
+	&& pip install --force-reinstall -U pip==${pipver} \
         && pip install setuptools==20.10.1
 make install-dependencies
 make test
@@ -35,7 +36,7 @@ pushd testenv1/not-${module}; ../bin/${run_tests}; popd
 cd testenv2
 source bin/activate
 rm lib/python-wheels/setuptools* \
-	&& pip install --force-reinstall -U pip==1.5.6 \
+	&& pip install --force-reinstall -U pip==${pipver} \
         && pip install setuptools==20.10.1
 pip install -e git+${repo}@${HEAD}#egg=${package}
 cd src/${package}
@@ -53,7 +54,7 @@ bin/${run_tests}
 cd ../testenv3/
 source bin/activate
 rm lib/python-wheels/setuptools* \
-	&& pip install --force-reinstall -U pip==1.5.6 \
+	&& pip install --force-reinstall -U pip==${pipver} \
         && pip install setuptools==20.10.1
 pip install ${package}*tar.gz
 pip install pytest