Merge pull request #38 from indigotech/docs/create-changelog

create changelog file

Author: felipesabino

docs/CHANGELOG.md

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+## 0.8.0
+
+### Feature
+
+- Added `@UnionType` decorator to allow [GraphQL Union Types](http://graphql.org/learn/schema/#union-types) - #21
+
+### Fixes
+
+- Added missing `@Arg` `isList` option - #17 
+- Fixing null returns for `@Pagination` - #19 
+
+## 0.7.0
+
+- Adding ability to ignore schema fields on @OrderBy - #11
+- Fixed type duplication issue - #13
+- Decorators are now less verbose - #12
+- Added Subscriptions - #14 
+
+## 0.6.0
+
+- Adding `@Before` middleware for field schema function resolution #8
+- Order by sort column is now non nullable - #9
+- Adding ability to add custom sort params to @OrderBy params - #10
+
+## 0.5.1
+
+- Explicit type assertion - #6 
+- Fixed return for Pagination info edge cases - #7 
+
+## 0.5.0
+
+- Based on https://github.com/indigotech/graphql-schema-decorator/pull/5
+
+# ⚠️  BREAKING CHANGES ⚠️ 
+
+- Now it supports only node `^6.10`
+
+## Other Changes
+
+- Updated typescript version to `2.3.4`
+- Fixed an issue when using nested input type objects 
+- Added tests for nested input changes
+- Removed typings and everything related
+- Configured travis to run properly
+- Fixed old broken tests (probably happened due to lack of CI for early releases/changes)
+- Fixed lint issues