downgrade SDoc

The new version has some minor issues, and old release branches
traditionally keep their theme anyway.

Gemfile

@@ -38,7 +38,7 @@ gem 'uglifier', '>= 1.3.0', require: false
 gem 'mime-types', '< 3', require: false
 
 group :doc do
-  gem 'sdoc', '>= 1.0.0.rc1', '< 1.1'
+  gem 'sdoc', '~> 0.4.0'
   gem 'redcarpet', '~> 3.1.2', platforms: :ruby
   gem 'w3c_validators', RUBY_VERSION < '2.0' ? '1.2' : nil
   gem 'kindlerb', '0.1.1'

Gemfile.lock

@@ -128,7 +128,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.1.0)
+    json (1.8.6)
     kindlerb (0.1.1)
       mustache
       nokogiri
@@ -175,7 +175,7 @@ GEM
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
     rake (12.0.0)
-    rdoc (5.1.0)
+    rdoc (4.3.0)
     redcarpet (3.1.2)
     redis (3.3.3)
     redis-namespace (1.5.3)
@@ -194,8 +194,9 @@ GEM
     ruby-prof (0.11.3)
     rufus-scheduler (3.4.2)
       et-orbi (~> 1.0)
-    sdoc (1.0.0.rc2)
-      rdoc (~> 5.0)
+    sdoc (0.4.2)
+      json (~> 1.7, >= 1.7.7)
+      rdoc (~> 4.0)
     sequel (4.47.0)
     serverengine (1.5.11)
       sigdump (~> 0.2.2)
@@ -284,7 +285,7 @@ DEPENDENCIES
   resque
   resque-scheduler
   ruby-prof (~> 0.11.2)
-  sdoc (>= 1.0.0.rc1, < 1.1)
+  sdoc (~> 0.4.0)
   sequel
   sidekiq
   sneakers (< 2.0.0)
@@ -297,4 +298,4 @@ DEPENDENCIES
   w3c_validators
 
 BUNDLED WITH
-   1.15.1
+   1.15.3