update links of documents

releases/2.0/release notes.md

@@ -10,10 +10,10 @@ Work on the proposed first-order logic / CLIF release of BFO 2.0 is continuing,
 The BFO 2.0 contains all classes defined in the  draft release (2012-11-15) except for some minor changes to metadata, such as relabel 'fiat object' to 'fiat object part'.
 
 The BFO 2.0 specification document is available on:
-https://github.com/BFO-ontology/BFO/raw/master/releases/2.0/BFO2-Reference.docx
+http://purl.obolibrary.org/obo/bfo/2.0/BFO2-Reference.docx
 
 The BFO 1.1 to BFO 2.0 IRI mapping file is available on:
-https://github.com/BFO-ontology/BFO/raw/master/releases/2.0/BFO1.1.1To2.0_mapping.xlsx
+http://purl.obolibrary.org/obo/bfo/2.0/BFO1.1.1To2.0_mapping.xlsx
 
 Details concerning automated support for migrating from BFO 1.1 to BFO 2.0 are available:
-http://bfoconvert.hegroup.org/
+http://bfoconvert.hegroup.org/