Use version from variable

dependencies/pathlib/meta.yaml

@@ -5,8 +5,8 @@ package:
   version: 1.0
 
 source:
-  fn: pathlib-1.0.tar.gz
-  url: https://pypi.python.org/packages/source/p/pathlib/pathlib-1.0.tar.gz
+  fn: pathlib-{{ version }}.tar.gz
+  url: https://pypi.python.org/packages/source/p/pathlib/pathlib-{{ version }}.tar.gz
   md5: a0a834e2ac9e280f9cfc3a06f5ac1ca3
 
 build: