Add NEWS bit for coord_quickmap

Author: jiho

NEWS

@@ -1,6 +1,13 @@
 ggplot2 0.9.3.1.99
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+* New coordinate system for small scale maps. `coord_quickmap()` computes and
+  sets the correct aspect ratio between one degree of latitude and one degree
+  of longitude at the centre of the plotted region. It does not perform full
+  fledged mapping projection as `coord_map()` does and therefore is much
+  faster. Yet, it gives a correct approximation for small scale maps (a few
+  degrees in either direction) at medium to low latitudes (@jiho, #922).
+
 * Allow specifying only one of the limits in a scale and use the automatic
   calculation of the other limit by passing NA to to the limit function,
   `xlim()` or `ylim()` (@jimhester, #557).