Conver API to markdown format for better readability.

API.txt → API.txt.md

 Flot Reference
---------------
+==============
 
 Consider a call to the plot function:
 
@@ -1168,7 +1168,7 @@ hooks in the plugins bundled with Flot.
 
  - drawOverlay  [phase 7]
 
-   function (plot, canvascontext)
+   function(plot, canvascontext)
 
    The drawOverlay hook is used for interactive things that need a
    canvas to draw on. The model currently used by Flot works the way
@@ -1185,7 +1185,7 @@ hooks in the plugins bundled with Flot.
 
  - shutdown  [phase 8]
 
-   function (plot, eventHolder)
+   function(plot, eventHolder)
 
    Run when plot.shutdown() is called, which usually only happens in
    case a plot is overwritten by a new plot. If you're writing a

README.txt.md

@@ -67,7 +67,7 @@ ready, run the plot function:
 Here, data is an array of data series and options is an object with
 settings if you want to customize the plot. Take a look at the
 examples for some ideas of what to put in or look at the reference
-in the file "API.txt". Here's a quick example that'll draw a line from
+in the file "API.txt.md". Here's a quick example that'll draw a line from
 (0, 0) to (1, 1):
 
     $.plot($("#placeholder"), [ [[0, 0], [1, 1]] ], { yaxis: { max: 1 } });