Add changelog

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/).
+
+## [0.4] - 2018-02-27
+
+### Added
+
+* `hidden_modules` attribute of the `haskell_library` rule. This allows to
+  selectively hide modules in a library. See
+  [#152](https://github.com/tweag/rules_haskell/issues/152).
+
+### Fixed
+
+* Test executables now find shared libraries correctly at runtime. See
+  [#151](https://github.com/tweag/rules_haskell/issues/151).
+
+* Building of certain modules does not fail with the “file name does not
+  match module name” message anymore. See
+  [#139](https://github.com/tweag/rules_haskell/issues/139).
+
+* Linking issues that resulted in unresolved symbols due to incorrect order
+  in which static libraries are passed to linker are not resolved. See
+  [#140](https://github.com/tweag/rules_haskell/issues/140).
+
+* The “grep not found” error is fixed. See
+  [#141](https://github.com/tweag/rules_haskell/pull/141).
+
+* System-level shared libraries introduced by `haskell_cc_import` are now
+  found correctly during compilation. See
+  [#142](https://github.com/tweag/rules_haskell/issues/142).
+
+## [0.3] - 2018-02-13
+
+## [0.2] - 2018-01-07
+
+## [0.1] - 2018-01-02