Cc12703-uiautomator2

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* fix 370
* test with 3.5

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* fix fix
* fix travis again
* fix travis
* update readme
* add missing dep:adbutils
* update xpath doc, add set\_text to xpath
* remove uiautomator2/adbutils.py, use thirdparty adbutils
* add quickstart, fix healthcheck for OnePlus
* fix screenshot method
* say goodbye to python2 and welcome python3
* Update ISSUE\_TEMPLATE.md
* use /dump/hierarchy to instead of call:dumpHierarchy
* update atx-agent version

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* xpath element support click
* add http\_timeout for shell function, resolve 353
* add xpath quicksheet
* resolve 348
* remove code which leads to minicap install error
* add get method of xpath
* add xpath::get\_text(), close 337
* add connect\_adb\_wifi function
* add probot link
* auto stale issue when tagged as invalid
* serial support none
* 修复多台设备时，list-forward失败 (327)
* \`python -m uiautomator2 init\`初始化403报错，增加header atx\_agent\_url中报错变量错误修复

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* update atx-agent version
* typo (318)
* fix connect\_usb error

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* fix 317, fix 316

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* merge change
* remove pure-python-adb dependency, use adbutils.py instead
* format \_\_init\_\_.py, update adbutils with ADB Protocol
* update changelog
* part of job