[conda] Ship requirements.txt with documentation so links can be correctly found

conda/meta.yaml

@@ -20,7 +20,7 @@ build:
     # installs the documentation source, readme to share/doc so it is available
     # during test time
     - install -d "${PREFIX}/share/doc/{{ name }}"
-    - cp -R README.rst doc "${PREFIX}/share/doc/{{ name }}/"
+    - cp -R README.rst requirements.txt doc "${PREFIX}/share/doc/{{ name }}/"
 
 requirements:
   host: