Update readme

Mainly just remark-lint issues fixed.

Author: Arcanemagus

README.md

@@ -1,14 +1,19 @@
-linter-lua
-===========
+# linter-lua
 
 linter-lua package will lint your `lua` in Atom through luac or [luajit](http://luajit.org/running.html).
 
-Due to the way that luac works it will only notify you of the first error found in the file.
+Due to the way that luac works it will only notify you of the first error found
+in the file.
 
-#### Linter Installation
-Before using this package, you must ensure that `luac` or `luajit` is installed on your system.
+## Installation
 
-#### Installation
+### Linter Installation
 
-* `$ apm install linter` (if you don't have [AtomLinter/Linter](https://github.com/AtomLinter/Linter) installed).
-* `$ apm install linter-lua`
+Before using this package, you must ensure that `luac` or `luajit` is installed
+on your system.
+
+### Package installation
+
+```ShellSession
+apm install linter linter-lua
+```