Remove sudo from installation method (#142)

Author: Ran-Y

README.md

@@ -15,7 +15,7 @@ A `Node.js` based command-line client for [tldr](https://github.com/tldr-pages/t
 ## Installing
 
 ```bash
-sudo npm install -g tldr
+npm install -g tldr
 ```
 ## Usage
 
@@ -130,6 +130,10 @@ fpath = (my/completions $fpath)
 
 ## FAQ
 
+#### `npm install -g tldr` throws an error
+
+You probably have a permission problem, which you can solve [Here](https://docs.npmjs.com/getting-started/fixing-npm-permissions).
+
 #### Colors under Cygwin
 
 Colors can't be shown under Mintty or PuTTY, because the dependency `colors.js` has a bug.