Update ex-VD affiliations (#417)

diff --git a/_data/committers.yml b/_data/committers.yml
index 9a0709c..b143721 100644
--- a/_data/committers.yml
+++ b/_data/committers.yml
@@ -150,7 +150,7 @@
 - name: Nic Crane
   role: PMC
   alias: thisisnic
-  affiliation: Voltron Data
+  affiliation: Independent
 - name: P. Taylor Goetz
   role: PMC
   alias: ptgoetz
@@ -311,7 +311,7 @@
 - name: Jonathan Keane
   role: Committer
   alias: jonkeane
-  affiliation: Voltron Data
+  affiliation: Independent
 - name: Kazuaki Ishizaki
   role: Committer
   alias: kiszk