pump version to 1.6.0 (binance#102)

Fox release 1.5.0 (binance#92)

* exchangeInfo endpoints now supports single or multi symbol query (binance#85)

* 2430 add precommit hook (binance#86)

* add c2c endpoints (binance#88)

* add testcase

* add orderId in /myTrades endpoint (binance#91)

* add orderId in /myTrades endpoint

* fixing test case

* pump version to 1.5.0

* add links in rst doc files

Co-authored-by: Chai <31032561+chairz@users.noreply.github.com>
Co-authored-by: ishuen <12228644+ishuen@users.noreply.github.com>

New release 1.4.0 (binance#78)

pump version (binance#73)