Bump RuboCop version to 0.77

https://github.com/rubocop-hq/rubocop/releases/tag/v0.77.0

* Update cop names to changed as follows:

```
$ bundle exec rubocop
Error: The `Layout/IndentFirstArgument` cop has been renamed to `Layout/FirstArgumentIndentation`.
(obsolete configuration found in .rubocop.yml, please update it)
The `Layout/TrailingBlankLines` cop has been renamed to `Layout/TrailingEmptyLines`.
(obsolete configuration found in .rubocop.yml, please update it)
The `Lint/StringConversionInInterpolation` cop has been renamed to `Lint/RedundantStringCoercion`.
(obsolete configuration found in .rubocop.yml, please update it)
$
```

* Auto correct these offenses:

```
$ bundle exec rubocop -a
... snip ...
Offenses:

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb:104:11: C: [Corrected] Style/RedundantReturn: Redundant return detected.
          return true
          ^^^^^^
activerecord/lib/active_record/reflection.rb:622:15: C: [Corrected] Style/RedundantReturn: Redundant return detected.
              return inverse_name
              ^^^^^^
activerecord/lib/active_record/table_metadata.rb:48:9: C: [Corrected] Style/RedundantReturn: Redundant return detected.
        return self
        ^^^^^^

2812 files inspected, 3 offenses detected, 3 offenses corrected
$
```

.rubocop.yml

@@ -82,7 +82,7 @@ Layout/EmptyLinesAroundModuleBody:
 Style/HashSyntax:
   Enabled: true
 
-Layout/IndentFirstArgument:
+Layout/FirstArgumentIndentation:
   Enabled: true
 
 # Method definitions after `private` or `protected` isolated calls need one
@@ -170,8 +170,8 @@ Style/StringLiterals:
 Layout/Tab:
   Enabled: true
 
-# Blank lines should not have any spaces.
-Layout/TrailingBlankLines:
+# Empty lines should not have any spaces.
+Layout/TrailingEmptyLines:
   Enabled: true
 
 # No trailing whitespace.
@@ -198,7 +198,7 @@ Lint/RequireParentheses:
 Lint/ShadowingOuterLocalVariable:
   Enabled: true
 
-Lint/StringConversionInInterpolation:
+Lint/RedundantStringCoercion:
   Enabled: true
 
 Lint/UriEscapeUnescape:

Gemfile.lock

@@ -348,7 +348,7 @@ GEM
     nokogiri (1.10.4-x86-mingw32)
       mini_portile2 (~> 2.4.0)
     os (1.0.1)
-    parallel (1.19.0)
+    parallel (1.19.1)
     parser (2.6.5.0)
       ast (~> 2.4.0)
     path_expander (1.1.0)
@@ -408,7 +408,7 @@ GEM
       resque (>= 1.26)
       rufus-scheduler (~> 3.2)
     retriable (3.1.2)
-    rubocop (0.76.0)
+    rubocop (0.77.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.6)

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -101,7 +101,7 @@ module ActiveRecord
       def self.database_exists?(config)
         config = config.symbolize_keys
         if config[:database] == ":memory:"
-          return true
+          true
         else
           database_file = defined?(Rails.root) ? File.expand_path(config[:database], Rails.root) : config[:database]
           File.exist?(database_file)

activerecord/lib/active_record/reflection.rb

@@ -619,7 +619,7 @@ module ActiveRecord
             end
 
             if valid_inverse_reflection?(reflection)
-              return inverse_name
+              inverse_name
             end
           end
         end

activerecord/lib/active_record/table_metadata.rb

@@ -45,7 +45,7 @@ module ActiveRecord
       association = klass._reflect_on_association(table_name) || klass._reflect_on_association(table_name.to_s.singularize)
 
       if !association && table_name == arel_table.name
-        return self
+        self
       elsif association && !association.polymorphic?
         association_klass = association.klass
         arel_table = association_klass.arel_table.alias(table_name)