Omspy

Features
* New `OrderStrategy` class added, an abstraction over CompoundOrder
* OrderLock mechanism added to `Order` so that each order would have its own unique lock

This is a bug-fix version and enhancement version

Fixes
* 20 You can now pass order arguments to `PegExisting` and `PegSequential`
* 18 timezone to default to local instead of UTC
* 11 pending quantity to be automatically updated

Features
* CandleStick class added to models
* Cancel subsequent orders in `PegSequential` if one of the orders fail

Improvements
* `is_done` method added to `Order` - returns True when the order is either complete or canceled or rejected.
* cancel peg orders after expiry

Fixes
* `order_cancel` not to be called when no order_id is None

Improvements
* Extra order mappings for SLM and SLL added to finvasia broker
* `order_type` argument resolved for kotak broker

Features
* Broker support added for **finvasia**
* New order type `PegSequential` added to peg orders in sequence

Improvements
* Order Lock mechanism added
* ExistingPeg to check for time expiry before next peg