move the algorithm figure down

README.md

@@ -50,8 +50,6 @@ non-standard dependency is [zlib][zlib].
 
 ### <a name="map"></a>Sequence-to-graph mapping
 
-<img align="right" width="278" src="doc/example2.png"/>
-
 To map sequences against a graph, you should prepare the graph in the [GFA
 format][gfa1], or preferrably the [rGFA format][rgfa]. If you don't have
 a graph, you can generate a graph from multiple samples (see the [Graph
@@ -103,6 +101,8 @@ Prebuilt human graphs in the rGFA format can be found at
 
 ### <a name="algo"></a>Algorithm overview
 
+<img align="right" width="278" src="doc/example2.png"/>
+
 In the following, minigraph command line options have a dash ahead and are
 highlighted in bold. The description may help to tune minigraph parameters.