Add core2 to the test feature matrix

tcharding · tcharding · commit e7f55133d49f · 2022-01-31T14:30:55.000+11:00
`core2` is not part of the feature matrix, add it.
diff --git a/contrib/test.sh b/contrib/test.sh
@@ -1,6 +1,6 @@
 #!/bin/sh -ex
 
-FEATURES="serde serde-std std"
+FEATURES="serde serde-std std core2"
 
 if [ "$DO_ALLOC_TESTS" = true ]; then
 	FEATURES="$FEATURES alloc"
