README.md in onnxruntime-0.5.2 vs README.md in onnxruntime-0.6.0

@@ -12,15 +12,9 @@
 
 ```ruby
 gem 'onnxruntime'
 ```
 
-On Mac, also install OpenMP:
-
-```sh
-brew install libomp
-```
-
 ## Getting Started
 
 Load a model and make predictions
 
 ```ruby