updated CHANGELOG

Author: matthewhanson

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Added
 
-- HIERARCHICAL_LINKS array constant of all the types of hierarchical links (self is not included)
+- HIERARCHICAL_LINKS array constant of all the types of hierarchical links (self is not included) ([#290](https://github.com/stac-utils/pystac/pull/290))
 
 ### Fixed
 
@@ -13,13 +13,13 @@
 
 ### Changed
 
-- Link behavior - link URLs can be either relative or absolute. Hierarchical (e.g., parent, child) links are made relative or absolute based on the value of the root catalog's `catalog_type` field
-- Internal self hrefs are set automatically when adding Items or Children to an existing catalog. This removes the need to call `normalize_hrefs` or manual setting of the hrefs for newly added STAC objects
-- Catalog.generate_subcatalogs is an order of magnitude faster
+- Link behavior - link URLs can be either relative or absolute. Hierarchical (e.g., parent, child) links are made relative or absolute based on the value of the root catalog's `catalog_type` field ([#290](https://github.com/stac-utils/pystac/pull/290))
+- Internal self hrefs are set automatically when adding Items or Children to an existing catalog. This removes the need to call `normalize_hrefs` or manual setting of the hrefs for newly added STAC objects ([#294](https://github.com/stac-utils/pystac/pull/294))
+- Catalog.generate_subcatalogs is an order of magnitude faster ([#295](https://github.com/stac-utils/pystac/pull/295))
 
 ### Removed
 
-- Removed LinkType class and the `link_type` field from links
+- Removed LinkType class and the `link_type` field from links ([#290](https://github.com/stac-utils/pystac/pull/290))
 
 ## [v0.5.5]