Updated the definition of scale_color_continuous (#3079)

* Updated the definition of scale_color_continuous to be scale_colour_continous instead of gradient so that it functions as the documentation states.

* Updated NEWS.md to document the change of scale_color_continuous() now pointing at scale_colour_continuous()

* Fixed backtick in NEWS.md

Author: hlendway

NEWS.md

@@ -1,5 +1,8 @@
 # ggplot2 3.1.0.9000
 
+* `scale_color_continuous()` now points at `scale_colour_continuos()` so that it 
+  will handle `type = "viridis"` as the documentation states (@hlendway, #3079).
+
 * `scale_shape_identity()` now works correctly with `guide = "legend"` (@malcolmbarrett, #3029)
 
 * Facet strips on the left side of plots now have clipping turned on, preventing

R/zxx.r

@@ -112,7 +112,7 @@ scale_color_distiller <- scale_colour_distiller
 #' @export
 #' @rdname scale_gradient
 #' @usage NULL
-scale_color_continuous <- scale_colour_gradient
+scale_color_continuous <- scale_colour_continuous
 
 #' @export
 #' @rdname scale_hue