Upgrade default_value_for from 3.0.1 to 3.0.2.

Includes support for Rails 5.

Changelog: https://github.com/FooBarWidget/default_value_for/compare/release-3.0.1...release-3.0.2

Gemfile.lock

@@ -152,8 +152,8 @@ GEM
     database_cleaner (1.4.1)
     debug_inspector (0.0.2)
     debugger-ruby_core_source (1.3.8)
-    default_value_for (3.0.1)
-      activerecord (>= 3.2.0, < 5.0)
+    default_value_for (3.0.2)
+      activerecord (>= 3.2.0, < 5.1)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     devise (4.1.1)