Merge pull request #15 from contentstack/tokenHotfix

Change log file added

Author: uttamukkoji

CHANGELOG.md

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+
+## CHANGELOG
+------------------------------------------------
+
+## Version 1.6.1
+###### Date: 08-May-2020
+### Bug
+    - Stack api key and access token moved to header
+------------------------------------------------
+
+## Version 1.6.0
+###### Date: 04-Mar-2020
+### Bug
+    - Issue in Asset for conflict in name of Query function has been resolved, Updated BaseQuery function name to addQuery.
+
+------------------------------------------------
+
+## Version 1.5.1
+###### Date: 17-Feb-2020
+### Bug
+    - Query array passing issue resolved
+
+------------------------------------------------
+
+## Version 1.5.0
+###### Date: 21-Nov-2019
+### New Feature
+    - Region support added
+
+------------------------------------------------
+
+## Version 1.4.0
+###### Date: 18-Nov-2019
+### Enhancement
+    - Stack 
+        - Added support for function 'getContentType'
+    - ContentType
+        - updated function 'fetch'
+    - Query
+        - Added support for function 'includeContentType'
+
+------------------------------------------------
+
+## Version 1.3.0
+###### Date: 02-Aug-2019 
+### Enhancement
+    - Query and Entry
+        - 'includeReferenceContentTypeUID' method includes the content type UIDs of the referenced entries returned in the response.
+
+------------------------------------------------
+
+## Version 1.2.1
+###### Date: 25-May-2019
+### Bug
+    - Made changes in helper file for fetching proper data on language query
+
+------------------------------------------------
+
+## Version 1.2.1
+###### Date: 19-Sept-2018
+### Bug
+    - Replaced the createError method with New method contentstackcreateError.
+
+------------------------------------------------
+
+## Version 1.2.0
+###### Date: 21-Dec-2017
+### Enhancement
+    - Entry 
+        - 'addparam' method added
+    - Query  
+        - 'addparam' method added
+    - Asset 
+        - 'addparam' method added
+
+------------------------------------------------
+
+## Version 1.1.0
+###### Date: 09-Nov-2017
+### Enhancement
+    - Image Optimisation support added
+### Deprecated
+    - Deprecated includeSchema and added includeContentType in query
+
+------------------------------------------------