add CHANGELOG

Author: andreineculau

CHANGELOG.md

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+# CHANGELOG
+
+## 1.5.0
+
+### Breaking changes
+
+* KATT CLI defaults now to showing only the last transaction, but understands `--all` for previous behaviour #31
+* new Erlang pattern that includes error details #25
+
+### Notable changes
+
+* a BARE_MODE has been introduced, in order to build KATT with as few dependencies as possible #34 #38
+* textual diff for strings #20 (new Erlang pattern that includes error details)
+* added `runtime_value` and `runtime_validation` #29
+* KATT CLI can now convert [an HTTP Archive](http://www.softwareishard.com/blog/har-12-spec/) to an APIB file, making it easier to create scenarios
+* allow `katt:run` to take in a `#katt_blueprint` record, not just a path to an APIB file
+* switched lhttpc for hackney #17
+* switched mochijson3 for jsx
+
+[Full list of changes since 1.4.0](https://github.com/for-GET/katt/compare/for-GET:1.4.0...1.5.0-rc)
+
+
+## [1.4.0] - 2016-01-19
+
+### Breaking changes
+
+* allow chained scenarios in CLI KATT #19
+* normalize set errors 40c2613e163aede46069d6a9fb2122d551adff35
+
+### Notable changes
+
+* handle duplicate headers #14
+* handle request timeout #13
+* fix katt compilation as rebar dependencies #24
+
+[Full list of changes since 1.3.0](https://github.com/for-GET/katt/compare/for-GET:1.3.0...1.4.0)
+[Full list of changes since 1.3.1-rc](https://github.com/for-GET/katt/compare/for-GET:1.3.1-rc...1.4.0)
+
+
+## [1.3.0] - 2015-03-15
+
+### Notable changes
+
+* **standalone** katt executable (with Erlang/JSON output)
+  * progress output to stderr
+* complex/multiple store (match and store a substring in a param)
+  * storing is optional as one can use {{_}} to match any substring
+* support complex validations via a special `{ "{{type}}": "....", "type_specific_arg1": ..., ... }` pattern
+  * built-in `set` comparison - JSON array with no specific order
+* extensions (XML example in README)
+* progress callback
+* request timeout and transaction description can be set via HTTP request headers
+* request can be delayed (put to sleep) via HTTP request header
+* optimized, refactored, moved shit around, fixed bugs
+
+[Full list of changes since 1.2.6](https://github.com/for-GET/katt/compare/for-GET:1.2.6...1.3.0)
+[Full list of changes since 1.3.0-rc](https://github.com/for-GET/katt/compare/for-GET:1.3.0-rc...1.3.0)
+
+
+## [1.2.6] - 2014-07-31