Improve readme.

Author: awulkiew

README.md

@@ -48,9 +48,9 @@ Supported:
 * Boost.CircularBuffer: `circular_buffer`
 * Boost.Container: `vector`, `static_vector`
 * Boost.Geometry:
-  * de9im: `mask`, `matrix`, `static_mask`
-  * index: `rtree`
-  * model: `point`, `point_xy`, `box`, `segment`, `referring_segment`, `linestring`, `polygon`, `multi_point`, `multi_linestring`, `multi_polygon`, `nsphere`
+  * `de9im`: `mask`, `matrix`, `static_mask`
+  * `index`: `rtree`
+  * `model`: `point`, `point_xy`, `box`, `segment`, `referring_segment`, `linestring`, `polygon`, `multi_point`, `multi_linestring`, `multi_polygon`, `nsphere`
 * Boost.MPL: `int_`, `size_t`, `integral_c`, `vector`, `vector_c`
 * Boost.Polygon: `point_data`, `interval_data`, `segment_data`, `rectangle_data`, `polygon_data`, `polygon_with_holes_data`
 * Boost.Tuple: `tuple`