Improve README formatting

Improved just a little bit

Author: Coal

README.md

@@ -2,13 +2,15 @@
 
 LPM is a package manager for the Lua language, designed to be flexible, extensible and easy to use.
 
-<span>Last Commit ([lpm](https://github.com/coalio/lpm/commits/master)):
+---
+
+Last Commit ([lpm](https://github.com/coalio/lpm/commits/master))
+
 [![Last Commit (lpm)](https://img.shields.io/github/last-commit/coalio/lpm)](https://github.com/coalio/lpm/commits/master)
-</span>
 
-<span>Last Commit ([lib-lpm](https://github.com/coalio/lib-lpm)):
+Last Commit ([lib-lpm](https://github.com/coalio/lib-lpm))
+
 [![Last Commit (lib-lpm)](https://img.shields.io/github/last-commit/coalio/lib-lpm)](https://github.com/coalio/lib-lpm/commits/master)
-</span>
 
 ```
 Usage: lpm <command> [... args]