Update CHANGELOG.md

Author: balazsdukai

CHANGELOG.md

@@ -5,19 +5,19 @@
 - Convert to Binary glTF (glb)
 - Convert to Batched 3D Models (b3dm) - Output is probably incorrect though
 - Progress bar for the `reproject` command
-- Started a proof of concept for an API. You can read about the first struggles in `docs/design_document.ipynb`. Mainly implemented in `models` and a few additional methods in `cityjson`. Plus a bunch of tests for the API (#13)
+- Started a proof of concept for an API. You can read about the first struggles in `docs/design_document.ipynb`. Mainly implemented in `models` and a few additional methods in `cityjson`. Plus a bunch of tests for the API ([#13](https://github.com/cityjson/cjio/pull/13))
 - Add tutorials and dedicated documentation 
-- Docker image and Travis build for it (#25)
-- Generate metadata (#56)
-- STL export format (#66)
+- Docker image and Travis build for it ([#25](https://github.com/cityjson/cjio/pull/25))
+- Generate metadata ([#56](https://github.com/cityjson/cjio/pull/56))
+- STL export format ([#66](https://github.com/cityjson/cjio/pull/66))
 
 ### Changed
 - click messages, warnings got their functions and placed into the `utils` module
 - only EPSG codes are supported for the CRS's URN
 - When `--indent` is passed to `save`, tabs are used instead of spaces. Results in smaller files.
 
 ### Fixes
-- Fix precision when removing duplicates (#50)
+- Fix precision when removing duplicates ([#50](https://github.com/cityjson/cjio/pull/60))
 
 
 ## [0.5.4] - 2019-06-18