Update simplecov requirement from ~> 0.15, < 0.18 to ~> 0.15, < 0.22

Gemfile.lock

@@ -11,13 +11,12 @@ GEM
     coderay (1.1.2)
     colorize (0.8.1)
     diff-lcs (1.3)
-    docile (1.3.2)
+    docile (1.3.5)
     fasterer (0.8.3)
       colorize (~> 0.7)
       ruby_parser (>= 3.14.1)
     ffaker (2.14.0)
     jaro_winkler (1.5.4)
-    json (2.3.0)
     method_source (1.0.0)
     parallel (1.19.1)
     parser (2.7.1.0)
@@ -61,11 +60,12 @@ GEM
     ruby_parser (3.14.2)
       sexp_processor (~> 4.9)
     sexp_processor (4.14.1)
-    simplecov (0.17.1)
+    simplecov (0.21.2)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.2)
     thor (1.0.1)
     unicode-display_width (1.7.0)
 
@@ -85,7 +85,7 @@ DEPENDENCIES
   rubocop-performance (~> 1.5)
   rubocop-rspec (~> 1.38)
   rubyhub!
-  simplecov (~> 0.15, < 0.18)
+  simplecov (~> 0.15, < 0.22)
 
 BUNDLED WITH
    2.1.4

rubyhub.gemspec

@@ -38,5 +38,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-md', '~> 0.3'
   spec.add_development_dependency 'rubocop-performance', '~> 1.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 1.38'
-  spec.add_development_dependency 'simplecov', '~> 0.15', '< 0.18'
+  spec.add_development_dependency 'simplecov', '~> 0.15', '< 0.22'
 end