added changelog and changelog generator script

Author: KaiSchwarz-cnic

HISTORY.md

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+### Changelog
+
+All notable changes to this project will be documented in this file. Dates are displayed in UTC.
+
+Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
+
+#### 1.0.0
+
+> 9 July 2018
+
+- initial PyPi package release [`eb2ac4c`](https://github.com/hexonet/python-sdk/commit/eb2ac4c6458a3620938e429878582e0b1ab93f00)
+- ignore .vscode subfolder [`67430e3`](https://github.com/hexonet/python-sdk/commit/67430e3419237823839b2946c324a93d7d8de22c)
+- added .gitignore [`946bc01`](https://github.com/hexonet/python-sdk/commit/946bc01b7c3505c28400aca50b9d9d4d4de33684)
+- Add files via upload [`aa2bc4d`](https://github.com/hexonet/python-sdk/commit/aa2bc4d5f92720c22b7853371ade371e1f95b9dd)
+- Create README.md [`400e58b`](https://github.com/hexonet/python-sdk/commit/400e58b5d2c0db4102ad207c65845a537d95aa93)
+- fix encoding problem (JIRA: HM-22) + fix in properties() results [`5dc88d4`](https://github.com/hexonet/python-sdk/commit/5dc88d4a85f90a7154d0ccde4df33faff0874591)
+- support for python2.5, use HTTP instead of HTTPS for the URL [`88cedbf`](https://github.com/hexonet/python-sdk/commit/88cedbf82075e19a957349dbc14b2836d99f2117)
+- support for python > 3; also backward compatible [`2756429`](https://github.com/hexonet/python-sdk/commit/27564296dcd0e0a388ce45b0e77c467e6d927a31)
+- Initial commit [`c89c917`](https://github.com/hexonet/python-sdk/commit/c89c917845cda5cef9e4f3a4fb5dc9d022e48006)

scripts/changelog.sh

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+#!/bin/bash
+auto-changelog --commit-limit false --output HISTORY.md; git add HISTORY.md