restore protomatter submodule ref

jepler · jepler · commit 64df244cf556 · 2020-08-01T17:10:05.000-05:00
diff --git a/lib/protomatter b/lib/protomatter
@@ -1 +1 @@
-Subproject commit 00e00ee8acb043b976302051291bc236ae2676cb
+Subproject commit 761d6437e8cd6a131d51de96974337121a9c7164
