Bump rubocop from 1.18.4 to 1.35.1

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.18.4 to 1.35.1.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.18.4...v1.35.1)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -106,7 +106,7 @@ group :development do
   gem "pronto-eslint", "~> 0.11.0", require: false
   gem "pronto-rubocop", "~> 0.11.2", require: false
   gem "pronto-scss", "~> 0.11.0", require: false
-  gem "rubocop", "~> 1.18.4", require: false
+  gem "rubocop", "~> 1.35.1", require: false
   gem "rubocop-performance", "~> 1.11.4", require: false
   gem "rubocop-rails", "~> 2.15.2", require: false
   gem "rubocop-rspec", "~> 2.4.0", require: false

Gemfile.lock

@@ -551,13 +551,14 @@ GEM
       rspec-mocks (~> 3.10)
       rspec-support (~> 3.10)
     rspec-support (3.11.0)
-    rubocop (1.18.4)
+    rubocop (1.35.1)
+      json (~> 2.3)
       parallel (~> 1.10)
-      parser (>= 3.0.0.0)
+      parser (>= 3.1.2.1)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.8.0, < 2.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.20.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.21.0)
@@ -784,7 +785,7 @@ DEPENDENCIES
   responders (~> 3.0.1)
   rinku (~> 2.0.6)
   rspec-rails (~> 5.1.2)
-  rubocop (~> 1.18.4)
+  rubocop (~> 1.35.1)
   rubocop-performance (~> 1.11.4)
   rubocop-rails (~> 2.15.2)
   rubocop-rspec (~> 2.4.0)