When will we release opencensus-ext-prometheus 0.3

[xiaopeng163]

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I installed with pip

pip install --upgrade opencensus opencensus-ext-prometheus prometheus-client

pip list | grep opencensus
opencensus                              0.11.2
opencensus-context                      0.1.3
opencensus-ext-prometheus               0.2.1

opencensus-ext-prometheus still is using the old version 0.2.1, an error will be raised

opencensus/ext/prometheus/stats_exporter/__init__.py", line 209, in to_metric
    aggregation_data_module.SumAggregationDataFloat):
AttributeError: module 'opencensus.stats.aggregation_data' has no attribute 'SumAggregationDataFloat'

SumAggregationDataFloat should be SumAggregationData, I saw we already fixed this issue in '0.3.dev0'

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