Fix the simple_graph example #97
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What does this Pull Request accomplish?
This fixes a performance issue with the simple_graph example. We weren't specifying a key for the st_echart, which caused it to be recreated for each script rerun, which is hugely inefficient. After making this fix, we can now update the graph at 10Hz instead of 1Hz.
Why should this Pull Request be merged?
We want our examples to use good practices.
What testing has been done?
Ran the simple_graph example and saw the graph updating smoothly.