Version 0.4.0

• Refactored core Traits;
• Refactored Sequence (it was a struct, now it's a trait);
• Added dynamic dispatching support for indicators;
• Added indicators docs;
• Vidya moved from indicators to methods;
• Added TSI method (True Strength Index);
• Added Trend Strength Index indicator;
• Changed Window indexes order;
• Fixed Fisher Transform indicator;
• Fixed serde rename support;
• Fixed Commodity Channel Index indicator;
• Fixed Woodies CCI indicator