message: Fixed the picture size
diff: @@ -94,11 +94,11 @@ make uninstall
  ```
  ### Performance
  -There is a test program [dataframe_performance](test/dataframe_performace.cc) that should give you some sense of how this library performs. It does the followings in about 300 to 400 milliseconds on my mac-book
  -![Alt text](docs/MacSize.png "About MacBook")
  +There is a test program [dataframe_performance](test/dataframe_performace.cc) that should give you some sense of how this library performs. It does the followings in about 300 to 400 milliseconds on my mac-book<BR>
  +<img src="docs/MacSize.png" alt="drawing" width="500"/>
  1. It generates about 16 million second resolution timestamps and loads it into the DataFrame
  2. It generates about 16 million random numbers each for 3 columns with normal, log normal, and exponential distributions and loads them into the DataFrame
  -3. It calculates mean each of the 3 columns
  +3. It calculates the mean of each of the 3 columns
  The program is compiled with gcc compiler with -O3 flag
  