Revert "Bump the piggieback dep to 0.3.2"

This reverts commit 08e0287.

The node repl is broken with 0.3.1 and 0.3.2, which resulted in broken
tests.

Author: bbatsov

project.clj

@@ -96,7 +96,7 @@
                         :resource-paths ["test/resources"]
                         :test-paths ["test/clj"]}
              :test-cljs {:test-paths ["test/cljs"]
-                         :dependencies [[cider/piggieback "0.3.2"]]}
+                         :dependencies [[cider/piggieback "0.3.0"]]}
 
              :sysutils {:plugins [[lein-sysutils "0.2.0"]]}