What's the master version is?

I want to check mx.symbol.contrib.quantized_conv in Pycharm.
But it give me a tip like below.
The version in my pc(win 10) is 1.1.0.
The quantized_conv api docs in official website says the version is master.

quantized_conv is a new operator introduced in 1.2. Please upgrade to MXNet 1.2 to use it.