[DOCS] Mention incubating in readme (#4401)

README.md

@@ -25,10 +25,9 @@
 [![Build Status](http://ci.tvm.ai:8080/buildStatus/icon?job=tvm/master)](http://ci.tvm.ai:8080/job/tvm/job/master/)
 [![Azure Pipeline](https://dev.azure.com/tvmai/tvm/_apis/build/status/windows_mac_build?branchName=master)](https://dev.azure.com/tvmai/tvm/_build/latest?definitionId=2&branchName=master)
 
-TVM is a compiler stack for deep learning systems. It is designed to close the gap between the
+Apache TVM (incubating) is a compiler stack for deep learning systems. It is designed to close the gap between the
 productivity-focused deep learning frameworks, and the performance- and efficiency-focused hardware backends.
 TVM works with deep learning frameworks to provide end to end compilation to different backends.
-Checkout the [tvm stack homepage](https://tvm.ai/)  for more information.
 
 License
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