make_metadata.py: Update URL to point to micropython-lib github page.

Author: pfalcon

make_metadata.py

@@ -19,7 +19,7 @@
       version='%(version)s',
       description=%(desc)r,
       long_description=%(long_desc)s,
-      url='https://github.com/micropython/micropython%3Cspan%20class="x x-first x-last">/issues/405',
+      url='https://github.com/micropython/micropython%3Cspan%20class="x x-first x-last">-lib',
       author=%(author)r,
       author_email=%(author_email)r,
       maintainer=%(maintainer)r,