Downgrade leakCanary from `1.5.2` to `1.5.1` to shun `Multiple dex files define Lcom/squareup/leakcanary/watcher/R;`. # see: https://github.com/square/leakcanary/issues/821#issuecomment-322364921
Downgrade leakCanary from `1.5.2` to `1.5.1` to shun `Multiple dex files define Lcom/squareup/leakcanary/watcher/R;`.
# see: https://github.com/square/leakcanary/issues/821#issuecomment-322364921

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