Make sure the schema.json files are included in the package

Author: fjwillemsen

MANIFEST.in

@@ -1,3 +1,4 @@
 include setup.py
 include LICENSE
 include README.rst
+include kernel_tuner/schema/T4/1.0.0/*

setup.py

@@ -26,6 +26,7 @@ def readme():
     license="Apache 2.0",
     keywords="auto-tuning gpu computing pycuda cuda pyopencl opencl",
     url="https://KernelTuner.github.io/kernel_tuner/",
+    include_package_data=True,  # use MANIFEST.in during install
     project_urls={
         "Documentation": "https://KernelTuner.github.io/kernel_tuner/",
         "Source": "https://github.com/KernelTuner/kernel_tuner",