Create CHANGELOG.md

Author: eduard93

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+## [0.7] - 2019-03-21
+### Added
+- Docker support.
+- (Experimental) `ExecuteFunction` support.
+- (Experimental) Proxyless Gateway support. 
+- `ExecuteQuery` support for types and namespaces.
+- JSON serialization for interoperability (also Repr, Pickle and Dill).
+- Saving context now saves user functions.
+- Python datatypes escaper: string, bool, date, time, timestamp.
+- Initializer interface.
+- Python shell: `do ##class(isc.py.util.Shell).Shell()`
+- Business Process emulator.
+- Sample %ZLANGC00 and %ZSTART routines.
+
+### Changed
+- Dill is now a required module.
+- `GetVariableInfo` now returns FQCN as type.
+- `GetVariableInfo` support for atributes (methods and the like).
+- Test process noe uses non-interactive GUI for test business process
+- Test process: new data, simplified code.
+- Log trace events enabled by default.
+
+### Removed
+- Test methods GetRandom, GetRandomSimple, SimpleStringFull from callout API
+
+
+## [0.6] - 2019-01-22
+### Added
+- Mac OS X support.
+- Linux - ability to load Python library explicitly.
+- ExcuteQuery - load data from query without xDBC.
+- Exception handling to Callout interface.
+
+### Changed
+- Test process now works in 3 modes: RAW, ODBC, JDBC.
+- Completed Main interface utility methods.
+
+## [0.5] - 2019-01-18
+### Added
+- Streams up to 2,147,483,647 bytes (~2Gb) now can be passed inside to python context and retrieved (up to IRIS limit) from it.
+- Mask and MaxLength conditions added to context persistence.
+- New class `isc.py.Main` as a main public interface.
+
+### Changed
+- Context persistence uses streams.
+
+## [0.4.2] - 2019-01-17
+### Changed
+- Pass/retrieve limit raized to 3 641 144 characters.
+
+## [0.4] - 2018-12-28
+### Added
+- Context persistence.
+- Serialization options.
+- Unit tests.
+- Error management.
+
+## [0.3] - 2018-12-24
+### Changed
+- Transfer limit raized to 3 641 144 characters.
+
+### Removed
+- Explicit initialization (now it's done implicitly).
+
+## [0.2] - 2018-12-20
+### Removed
+- Debugging.
+
+## [0.1.1] - 2018-12-18
+### Changed
+- Retrieving undefined variable does not crash the process now.
+
+## [0.1] - 2018-12-18
+### Added
+- Initial version.