[Minor]: updated change log
0.32.0
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+New: DrawSign allows signposts to be drawn with specific text.
+New: 'includeNBT' flag for ObservationFromRay, to return JSON NBTTagCompound for tile entities.
+New: 'decision_tree_test.py' to test signs/NBTTagCompound.
New: Titles and subtitles are now returned as part of the chat observation.
New: ObservationFromSystem to return stats on Minecraft's health (eg render/server/client ticks per second)
