Add VersionAdded metadata to cops who missing the version

All cops have `VersionAdded`. This PR adds `VersionAdded` metadata to
cops who missing the version.

The cops who were missing `VersionAdded` are:

- Migration/DepartmentName (0.75) ... 1f84782
- Lint/RedundantSplatExpansion (0.76) ... ba43182
- Lint/ToJSON (0.66) ... a823c57

Also `VersionAdded` does not include tiny version.

This PR will add these rules to the project_spec.rb.

config/default.yml

@@ -1594,7 +1594,7 @@ Lint/RedundantRequireStatement:
 Lint/RedundantSplatExpansion:
   Description: 'Checks for splat unnecessarily being called on literals.'
   Enabled: true
-  VersionChanged: '0.76'
+  VersionAdded: '0.76'
 
 Lint/RedundantStringCoercion:
   Description: 'Checks for Object#to_s usage in string interpolation.'
@@ -1725,6 +1725,7 @@ Lint/Syntax:
 Lint/ToJSON:
   Description: 'Ensure #to_json includes an optional argument.'
   Enabled: true
+  VersionAdded: '0.66'
 
 Lint/UnderscorePrefixedVariableName:
   Description: 'Do not use prefix `_` for a variable that is used.'
@@ -1908,6 +1909,7 @@ Migration/DepartmentName:
                  Check that cop names in rubocop:disable (etc) comments are
                  given with department name.
   Enabled: true
+  VersionAdded: '0.75'
 
 #################### Naming ##############################
 
@@ -2958,7 +2960,7 @@ Style/LambdaCall:
   Description: 'Use lambda.call(...) instead of lambda.(...).'
   StyleGuide: '#proc-call'
   Enabled: true
-  VersionAdded: '0.13.1'
+  VersionAdded: '0.13'
   VersionChanged: '0.14'
   EnforcedStyle: call
   SupportedStyles:

manual/cops_lint.md

@@ -1638,7 +1638,7 @@ require 'unloaded_feature'
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | - | 0.76
+Enabled | Yes | Yes  | 0.76 | -
 
 This cop checks for unneeded usages of splat expansion
 
@@ -2382,7 +2382,7 @@ into RuboCop's offenses.
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | - | -
+Enabled | Yes | Yes  | 0.66 | -
 
 This cop checks to make sure `#to_json` includes an optional argument.
 When overriding `#to_json`, callers may invoke JSON

manual/cops_migration.md

@@ -4,7 +4,7 @@
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | - | -
+Enabled | Yes | Yes  | 0.75 | -
 
 Check that cop names in rubocop:disable comments are given with
 department name.

manual/cops_style.md

@@ -3042,7 +3042,7 @@ EnforcedStyle | `line_count_dependent` | `line_count_dependent`, `lambda`, `lite
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 0.13.1 | 0.14
+Enabled | Yes | Yes  | 0.13 | 0.14
 
 This cop checks for use of the lambda.(args) syntax.
 

spec/project_spec.rb

@@ -27,6 +27,16 @@
       end
     end
 
+    it 'requires a nicely formatted `VersionAdded` metadata for all cops' do
+      cop_names.each do |name|
+        version = config[name]['VersionAdded']
+        expect(version.nil?).to(be(false),
+                                "VersionAdded is required for #{name}.")
+        expect(version).to(match(/\A\d+\.\d+\z/),
+                           "#{version} should be format ('X.Y') for #{name}.")
+      end
+    end
+
     it 'have a period at EOL of description' do
       cop_names.each do |name|
         description = config[name]['Description']