Fix build files

Author: sdispater

Makefile

@@ -5,7 +5,7 @@
 # http://www.opensource.org/licenses/MIT-license
 # Copyright (c) 2015 Sébastien Eustace
 
-PENDULUM_RELEASE := $$(sed -n -E "s/VERSION = '(.+)'/\1/p" pendulum/version.py)
+PENDULUM_RELEASE := $$(sed -n -E "s/VERSION = \"(.+)\"/\1/p" pendulum/version.py)
 
 # lists all available targets
 list:

build-wheels.sh

@@ -8,7 +8,7 @@ echo "Create Poetry's virtualenv"
 /opt/python/${POETRY_PYTHON}/bin/virtualenv --python /opt/python/${POETRY_PYTHON}/bin/python ${POETRY_VENV}
 ${POETRY_VENV}/bin/pip install poetry --pre
 
-RELEASE=$(sed -n "s/__version__ = '\(.*\)'/\1/p" /io/pendulum/__version__.py)
+RELEASE=$(sed -n "s/__version__ = \"\(.*\)\"/\1/p" /io/pendulum/__version__.py)
 
 echo "Compile wheels"
 for PYTHON in ${PYTHON_VERSIONS}; do