Change 'commercial' to 'other' in README.md
The linked page describes the limitations of all simulators, not just commercial simulators.
@@ -20,8 +20,8 @@ Cocotb requires:
- A C++11 compiler
- An HDL simulator (such as [Icarus Verilog](http://iverilog.icarus.com/),
[Verilator](https://www.veripool.org/wiki/verilator),
-[GHDL](http://ghdl.free.fr/) or a
-[commercial simulator](https://docs.cocotb.org/en/stable/simulator_support.html))
+[GHDL](http://ghdl.free.fr/) or
+[other simulator](https://docs.cocotb.org/en/stable/simulator_support.html))
After installing these dependencies, the latest stable version of cocotb can be installed with pip.
