Qteasy

- this update contains only bug fixes

What's Changed
* updated documents by shepherdpp in https://github.com/shepherdpp/qteasy/pull/104
* Qt dev1.0 by shepherdpp in https://github.com/shepherdpp/qteasy/pull/105
* update to version 1.0.21 by shepherdpp in https://github.com/shepherdpp/qteasy/pull/106


**Full Changelog**: https://github.com/shepherdpp/qteasy/compare/1.0.20...1.0.21

- Fixed mistakes in ta-lib compatible functions `EMA()`, `MACD()`, `TRIX()`, and `DEMA()`, now they can be used without `ta-lib` installed, although the results are slightly different from their talib versions

What's Changed
* Qt dev1.0 by shepherdpp in https://github.com/shepherdpp/qteasy/pull/102
* prepared to update to version 1.0.20 by shepherdpp in https://github.com/shepherdpp/qteasy/pull/103


**Full Changelog**: https://github.com/shepherdpp/qteasy/compare/1.0.19...1.0.20

- Removed dependency on `ta-lib` package for ta functions `RSI()`, `MA()`, and `BBANDS()`, thus candle charts can be created without `ta-lib` installed
- Updated dependencies, made package more use-able for beginners with no `ta-lib` and only basic `tushare` credits

- Improved trader shell live messages: now order execution results are better displayed with more info regarding change of stock qty and cash amounts
- Command `INFO` and `OVERVIEW` in trader shell now will not print out system information in default.
- Updated version requirements for numpy
- Bug fixes

- Improved trader shell command `run`, now it can run a strategy in main thread in debug mode, making it easier to debug
- Fixed a bug that will cause error acquiring live price in live trade mode if running freqency is lower than 1 hour

- Added feature: if a valid trade signal can not be converted to an order due to lack of available cash/stock, a message will be posted in live mode
- Fixed a bug in live trade mode that will cause trade results being processed and delivered for more than one time, thus leads to wrong available qty or available cash recorded
- Fixed a mistake that will cause wrong cost being calculated during live trade
- Fixed a mistake in live trade shell with command history, that wrong stock cost is calculated when history of multiple stocks are listed
- Fixed bug in issue 85 where data are extracted and filled unexpectedly in non-trading days
- Fixed other bugs