chore: update readme instructions

Author: aminya

README.md

@@ -10,9 +10,9 @@ Vue language support for [Atom IDE][]
 
   Note: Since Atom comes with [autocomplete+](https://atom.io/packages/autocomplete-plus) package preinstalled, basic suggestions should be available immediately.
 
-2. [Optional] Install [language-vue](https://atom.io/packages/language-vue)
+2. Install [language-vue](https://atom.io/packages/language-vue)
 
-3. [Optional] Install [Atom IDE][] packages
+3. Install [Atom IDE][https://atom.io/packages/atom-ide-base] packages
 
 ## Contributing