[ImgBot] Optimize images

*Total -- 328.11kb -> 222.77kb (32.11%)

/plots/lstm_binary.png -- 22.79kb -> 8.12kb (64.36%)
/plots/ae_binary.png -- 19.95kb -> 7.32kb (63.3%)
/plots/mlp_multi.png -- 21.07kb -> 7.79kb (63.04%)
/plots/ae_multi.png -- 20.08kb -> 7.48kb (62.77%)
/plots/mlp_binary.png -- 20.87kb -> 7.80kb (62.63%)
/plots/Pie_chart_multi.png -- 24.38kb -> 18.80kb (22.88%)
/plots/Pie_chart_binary.png -- 18.68kb -> 14.50kb (22.35%)
/plots/ae_multi_accuracy.png -- 21.54kb -> 16.80kb (21.98%)
/plots/ae_binary_accuracy.png -- 20.47kb -> 16.04kb (21.67%)
/plots/mlp_binary_accuracy.png -- 18.70kb -> 15.39kb (17.69%)
/plots/lstm_binary_loss.png -- 22.29kb -> 18.84kb (15.46%)
/plots/mlp_multi_loss.png -- 14.88kb -> 12.60kb (15.35%)
/plots/lstm_binary_accuracy.png -- 23.58kb -> 20.02kb (15.09%)
/plots/mlp_binary_loss.png -- 14.86kb -> 12.88kb (13.33%)
/plots/mlp_multi_accuracy.png -- 15.88kb -> 13.80kb (13.08%)
/plots/ae_multi_loss.png -- 14.04kb -> 12.29kb (12.48%)
/plots/ae_binary_loss.png -- 14.04kb -> 12.29kb (12.47%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp