README.md: reformat

[ci skip]

README.md

@@ -1,51 +1,56 @@
 zoom-cache: A streamable, seekable, zoomable cache file format
 ==============================================================
 
-Goals
------
+These are some of the goals of the zoom-cache format:
 
-  Writing
+Writing
+-------
 
     * can be written to in streaming manner, with no backseeking
 
-  Reading
+Reading
+-------
 
     * can be read in one pass with no backseeking
     * can be seeked on time-wise
     * sections can be extracted
     * can be read at varying zoom levels
 
-  Data
+Data
+----
 
     * Support multiple data types (float/double, int, bool, char)
     * support multiple aggregation types for zooming (min/max, mean, rms, all/any,
         text summary)
     * Constant or variable bitrates streams
 
-  Library
+Library
+-------
 
     * Simple stream writing interface
     * Simple stream reading interface
     * Read seek interface
     * Read set-zoom-level interface
 
-  Tools
+Tools
+-----
 
     * Verification
     * Info
 
 
-Data Streams and Summary Streams
-
 Interleaved streams
+-------------------
 
   * Sync points
 
 Index files
+-----------
 
   * A documented way of generating time index files
 
 Exploded form
+-------------
 
   * one file per stream