Declare readme content type for PyPi

Change-Id: I2ac05bfe9f2e695fa9caaa2ec8d96fe9d574a0ec
diff --git a/setup.py b/setup.py
index fcde834..062a168 100644
--- a/setup.py
+++ b/setup.py
@@ -54,6 +54,7 @@
     name='aiymakerkit',
     description='Simple API for ML inferencing with TF Lite and Coral Edge TPU',
     long_description=read('README.md'),
+    long_description_content_type='text/markdown',
     license='Apache 2',
     version=find_version(read('aiymakerkit/__init__.py')),
     author='Coral',