Triton can be installed using pip

Added the right command in the README.md file to install Triton using
pip, since `pip install triton` installs an entirely different package.

Author: gl

README.md

@@ -91,8 +91,15 @@ from triton import *
 '0xdead'
 ```
 
+## Install using pip
 
-## Install
+Triton can be installed using `pip`:
+
+```console
+pip install triton-library
+```
+
+## Install from source
 
 Triton relies on the following dependencies:
 
@@ -105,7 +112,6 @@ Triton relies on the following dependencies:
 * llvm          (optional)   >= 12
 ```
 
-
 ### Linux and MacOS
 
 ```console