[Feature Request] Improve the paper filter

[wanghaoxue0]

I think we can give more accurate definition of the keywords and its corresponding paper:

keywords:
"Machine Learning in Finance":
filters: ["Machine Learning in Finance", "Statistical Finance"]
"Deep Learning in Finance":
filters: ["Deep Learning in Finance", "Computational Engineering, Finance, and Science"]
"Reinforcement Learning in Finance":
filters: ["Reinforcement Learning in Finance"]
"Time Series Forecasting":
filters: ["Time Series Forecasting"]