use default version of numpy in conda build command

Author: oleksandr-pavlyk

.travis.yml

@@ -28,4 +28,4 @@ install:
   - g++ -v
 
 script:
-  - conda build -c intel -c conda-forge --override-channels --numpy=1.17 $PYVER conda-recipe
+  - conda build -c intel -c conda-forge --override-channels $PYVER conda-recipe