Bump version to 10.5.6.0

Author: ericmehl

Changes

@@ -1,7 +1,10 @@
-10.5.x.x (relative to 10.5.5.0)
+10.5.x.x (relative to 10.5.6.0)
 ========
 
-API
+10.5.6.0 (relative to 10.5.5.0)
+========
+
+Improvements
 ------------
 
 - `IECoreGL::Selector`: Added constructor overload that accepts a boolean indicating a more precise, camera-space depth sample will be used to sample depth instead of OpenGL's depth buffer.

SConstruct

@@ -56,7 +56,7 @@ SConsignFile()
 
 ieCoreMilestoneVersion = 10 # for announcing major milestones - may contain all of the below
 ieCoreMajorVersion = 5 # backwards-incompatible changes
-ieCoreMinorVersion = 5 # new backwards-compatible features
+ieCoreMinorVersion = 6 # new backwards-compatible features
 ieCorePatchVersion = 0 # bug fixes
 ieCoreVersionSuffix = "" # used for alpha/beta releases. Example: "a1", "b2", etc.