Update README.md

README.md

@@ -35,7 +35,7 @@ Just copy the files to your build tree and use a C++11 compiler
 
 Below are some [benchmarks](bench) comparing popular log libraries under Ubuntu 64 bit, Intel i7-4770 CPU @ 3.40GHz 
 
-### Synchronous mode
+#### Synchronous mode
 Time needed to log 1,000,000 lines under synchronous mode (the best of 3 runs):
 
 |threads|boost log|glog   |easylogging |spdlog|
@@ -45,7 +45,7 @@ Time needed to log 1,000,000 lines under synchronous mode (the best of 3 runs):
 |100|     15.008  |1.139s |4.512s     :|0.497s|
 
 
-### Asynchronous mode 
+#### Asynchronous mode 
 Time needed to log 1,000,000 lines under asynchronous mode, i.e. the time it takes to put the messages in the async queue (the best of 3 runs):
 
 |threads|g2log   |spdlog<sup>async mode</sup>|