fixed readme format

README.md

@@ -6,7 +6,7 @@ A big, fast and persistent queue based on memory mapped file.
 
 ***Double Notice***, I (Owner of Kairosdb) have forked this code with the intention of maintaining it.  It is some amazing code and it has been neglected for a few years.  BigQueue is a critical part of KairosDB and in other projects I've created. 
 
-##Feature Highlight:  
+## Feature Highlight:  
 1. **Fast**: close to the speed of direct memory access, both enqueue and dequeue are close to O(1) memory access.  
 2. **Big**: the total size of the queue is only limited by the available disk space.  
 3. **Persistent**: all data in the queue is persisted on disk, and is crash resistant.
@@ -20,12 +20,12 @@ A big, fast and persistent queue based on memory mapped file.
 
 ## The Big Picture
 
-###Memory Mapped Sliding Window
+### Memory Mapped Sliding Window
 
 ![design](http://bulldog2011.github.com/images/luxun/sliding_window.png)
 
 
-##Performance Highlight:
+## Performance Highlight:
 * In concurrent producing and consuming case, the average throughput is around ***166M bytes per second***.
 * In sequential producing then consuming case, the average throughput is around ***333M bytes per second***.
 
@@ -34,7 +34,7 @@ Suppose the average message size is 1KB, then big queue can concurrently produci
 
 [here is a detailed performance report](https://github.com/bulldog2011/bigqueue/wiki/Performance-Test-Report)
 
-##How to Use
+## How to Use
 1. Direct jar or source reference  
 Download jar from the github release section.   
 ***Note*** : bigqueue depends on log4j, please also added log4j jar reference if you use bigqueue.
@@ -49,7 +49,7 @@ Download jar from the github release section.
 		
 
 
-##Docs
+## Docs
 
 1. [a simple design doc](http://bulldog2011.github.com/blog/2013/01/23/big-queue-design/)
 2. [big queue tutorial](http://bulldog2011.github.com/blog/2013/01/24/big-queue-tutorial/)
@@ -76,7 +76,7 @@ Download jar from the github release section.
   * Initial version:)
 
 
-##Copyright and License
+## Copyright and License
 Copyright 2012 Leansoft Technology <[email protected]>
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with the License. You may obtain a copy of the License in the LICENSE file, or at: