NX endorses spec8 (#357)

We are still discussing this SPEC and decided to open this PR to have a
place where we can make comments and vote. We will leave this PR open
for a week or two.

Author: jarrodmillman

spec-0008/index.md

@@ -11,6 +11,7 @@ author:
   - "Jarrod Millman <millman@berkeley.edu>"
 discussion: https://discuss.scientific-python.org/t/spec-8-supply-chain-security
 endorsed-by:
+  - networkx
   - scikit-image
 ---