add Release History

HISTORY.md

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+# Release History
+
+## 2.0.1 (2019.01.18)
+
+Bugfixes:
+
+- override current teststep variables with former testcase output variables;
+- make compatible with testcase name is empty;
+- skip undefined variable when parsing string content;
+- add request method in report.
+
+## 2.0.0 (2019.01.01)
+
+- Massive Refactor and Simplification
+- Redesign testcase structure
+- Module pipline
+- Start Semantic Versioning
+- Switch to Apache 2.0 license
+- Change logo