Update note regarding lower version of choco package

Installing.md

@@ -42,7 +42,7 @@ In the [downloaded TTF folder](https://github.com/tonsky/FiraCode/tree/master/di
 
 - Use [chocolatey](https://chocolatey.org): `choco install firacode-ttf`
 
-_Note: chocolately will install Fira Code 2.0; the current version is 3.1_
+_Note: chocolately will install Fira Code 3.1; the current version is 4_
 
 - Use [scoop](https://github.com/lukesampson/scoop):