disable deprecated APIs in NumPy (from before version 1.7) to silence warning

setup.py

@@ -11,6 +11,7 @@ peakfinder8_ext = Extension(
     include_dirs = [peakfinder8_include_dir, numpy.get_include()],
     library_dirs = [peakfinder8_library_dir],
     libraries = ["peakfinder8"],
+    define_macros=[("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION")],
     language = "c++"
 )