Bump version v0.4.0

Author: ComplexPlane

rel/menu_defn.cpp

@@ -95,7 +95,7 @@ static Widget about_widgets[] = {
     {.type = WidgetType::Separator},
 
     {.type = WidgetType::Header, .header = {"Updates"}},
-    {.type = WidgetType::Text, .text = {"  Current version: v0.3.0"}},
+    {.type = WidgetType::Text, .text = {"  Current version: v0.4.0"}},
     {.type = WidgetType::Text, .text = {"  For the latest version of this mod:"}},
     {.type = WidgetType::ColoredText, .colored_text = {
         "  github.com/ComplexPlane/ApeSphere/releases", draw::BLUE}