Upgrade Cython version

This is needed to be able to build numpy

Author: andreypopp

Makefile.src

@@ -77,7 +77,7 @@ TOOL_PY = \
 	Sphinx==1.7.6 \
 	sphinx-rtd-theme==0.4.3 \
 	honcho==1.0.1 \
-	Cython==0.29.15 \
+	Cython==0.29.24 \
 	tidypy