Remove mention of cabal-install from README

Build scripts take care of it

Author: Anrock

README.md

@@ -128,14 +128,6 @@ git clone https://github.com/haskell/haskell-ide-engine --recursive
 cd haskell-ide-engine
 ```
 
-In order to support both stack and cabal, HIE requires `cabal-install`
-as well. If it is not already installed, install it and update its package list:
-
-```bash
-stack install cabal-install
-cabal update
-```
-
 #### Choose your GHC version
 
 The GHC version you are going to install HIE for depends on which version of GHC you are using for your project. If you don't have a current project there are two potential options:
@@ -227,14 +219,6 @@ git clone https://github.com/haskell/haskell-ide-engine --recursive
 cd haskell-ide-engine
 ```
 
-In order to support both stack and cabal, HIE requires `cabal-install`
-as well. If it is not already installed, install it and update its package list:
-
-```bash
-stack install cabal-install
-cabal update
-```
-
 #### Install *all* available GHC versions
 
 *Warning*: Requires 20+ GB of space and potentially more than 2 hours to install, so please be patient!