Fix readme for beta

Change-Id: If2b60eea84f73e9ac4747a36a14a8705b4a5acc7
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

README

@@ -1,5 +1,5 @@
 -----------------------------------
-Qt Data Visualization 1.0.0 (alpha)
+Qt Data Visualization 1.0.0 (beta)
 -----------------------------------
 
 Qt Data Visualization module provides multiple graph types to visualize data in 3D space
@@ -12,7 +12,7 @@ System Requirements
 - OpenGL 2.1 or newer (recommended) or OpenGL ES2 (reduced feature set)
 
 Platform specific recommendations:
-- Mac: OSX 10.8 recommended
+- Mac: OSX 10.8 or later recommended
 
 Building
 ========
@@ -79,16 +79,13 @@ Known Issues
   For example, Qt Creator application wizard for Qt Quick 2 applications
   creates by default an opaque white Rectangle element as the main element,
   which covers any graph added to it.
-- Using multiple graphs in one application crashes on application shutdown
-  unless the last graph to have active context is deleted last.
 - Android doesn't support both widgets and OpenGL simultaneously, so only
   the Qt Quick 2 API is usable in practice in Android.
 - Shadows are not supported with OpenGL ES2 (including Angle builds in Windows).
 - Anti-aliasing doesn't work with OpenGL ES2 (including Angle builds in Windows).
 - Surfaces with non-straight rows and columns do not always render properly.
-- Wrong item can end up selected if you do mouse selection and data removes/inserts
-  simultaneously due to the asynchronous nature of mouse selection handling.
 - Q3DLight class (and Light3D QML item) are currently not usable for anything.
 - Q3DScene::secondarySubviewOnTop property has currently no effect.
 - The color style Q3DTheme::ColorStyleObjectGradient doesn't work for surface graphs.
 - Scatter "point" meshes do not support gradients, they always use the base color.
+- Widget based examples layout incorrectly in iOS.