v0.8.3 🌈

Changes

• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/ADARNN @dependabot (#870)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/ADD @dependabot (#869)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/ALSTM @dependabot (#868)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/CatBoost @dependabot (#867)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/DoubleEnsemble @dependabot (#866)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/GRU @dependabot (#833)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/LightGBM @dependabot (#830)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/SFM @dependabot (#829)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/TCTS @dependabot (#834)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/GATs @dependabot (#831)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/TRA @dependabot (#832)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/Localformer @dependabot (#835)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/MLP @dependabot (#836)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/TCN @dependabot (#837)
• Bump numpy from 1.17.4 to 1.21.0 in /examples/benchmarks/LSTM @dependabot (#838)

🌟 Features

• fall back error @you-n-g (#875)
• Disable Cache By Default @you-n-g (#871)
• Supporting Arctic Backend Provider & Orderbook, Tick Data Example @luocy16 (#744)
• Add future calendar collector @zhupr (#795)

🐛 Bug Fixes

• Remove arctic from Qlib core to Contrib @you-n-g (#865)
• Fix pytorch_nn.py step bug @you-n-g (#864)

📚 Documentation

• Add Desc For the limitation of 3.9 @Wangwuyi123 (#863)
• Fix code and docs for issues @you-n-g (#853)