Update README.md

added macos gnuplot installation instructions

Author: gh0st42

README.md

@@ -17,7 +17,7 @@ $ git clone https://github.com/gh0st42/procrec
 $ cargo install --path .
 ```
 
-If you want plotting functionality you also need to install gnuplot via your package manager (e.g., `sudo apt install gnuplot`).
+If you want plotting functionality you also need to install gnuplot via your package manager (e.g., `sudo apt install gnuplot` or `brew install gnuplot`).
 
 ## Usage
 
@@ -80,4 +80,4 @@ Afterwards a gnuplot window pops up and visualizes the data:
 ## Alternatives
 
 - `pidstat` from the [sysstat package](https://github.com/sysstat/sysstat/) for pure recording, no plotting - written in C and probably available in most distro package managers
-- [psrecord](https://github.com/astrofrog/psrecord) a nice python tool for recording and plotting (using `matplotlib`) - installation via `pip` 
+- [psrecord](https://github.com/astrofrog/psrecord) a nice python tool for recording and plotting (using `matplotlib`) - installation via `pip`