Fix typo - lobsided -> lopsided (donnemartin#11)

Author: Jamstah

README.md

@@ -844,7 +844,7 @@ Common ways to shard a table of users is either through the user's last name ini
 ##### Disadvantage(s): sharding
 
 * You'll need to update your application logic to work with shards, which could result in complex SQL queries.
-* Data distribution can become lobsided in a shard.  For example, a set of power users on a shard could result in increased load to that shard compared to others.
+* Data distribution can become lopsided in a shard.  For example, a set of power users on a shard could result in increased load to that shard compared to others.
     * Rebalancing adds additional complexity.  A sharding function based on [consistent hashing](http://www.paperplanes.de/2011/12/9/the-magic-of-consistent-hashing.html) can reduce the amount of transferred data.
 * Joining data from multiple shards is more complex.
 * Sharding adds more hardware and additional complexity.