devkit: Bump amber-dev to 0.3.2.

Throws again on missing dependency.
Imports are not missing dependencies,
by faking 'Foo%Imports' module for each library 'Foo'
needed in amberc.

external/amber-dev/package.json

@@ -1,6 +1,6 @@
 {
   "name": "amber-dev",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Development goodies for Amber Smalltalk",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"