Update build-wheels.sh

Author: jhavl

.github/build-wheels.sh

@@ -15,6 +15,7 @@ cd ./io
 # Compile wheels
 for PYBIN in /opt/python/cp3*/bin; do
 #     "${PYBIN}/pip" install .
+    "${PYBIN}/pip" install numpy
 #     "${PYBIN}/pip" install pytest
     "${PYBIN}/pip" wheel /io/ --no-deps -w wheelhouse/
 done