Support Ruby 3.0 (Fixes Issue #509) (#514)

-Remove support for EOL ruby versions

Gemfile.lock

@@ -3,7 +3,7 @@ PATH
   specs:
     cfn-nag (0.0.0)
       aws-sdk-s3 (~> 1.76)
-      cfn-model (= 0.5.2)
+      cfn-model (= 0.6.0)
       lightly (~> 0.3.2)
       logging (~> 2.2.2)
       netaddr (~> 2.0.4)
@@ -14,26 +14,26 @@ GEM
   specs:
     ast (2.4.1)
     aws-eventstream (1.1.0)
-    aws-partitions (1.381.0)
-    aws-sdk-core (3.109.1)
+    aws-partitions (1.416.0)
+    aws-sdk-core (3.111.1)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.239.0)
       aws-sigv4 (~> 1.1)
       jmespath (~> 1.0)
-    aws-sdk-kms (1.39.0)
+    aws-sdk-kms (1.41.0)
       aws-sdk-core (~> 3, >= 3.109.0)
       aws-sigv4 (~> 1.1)
-    aws-sdk-s3 (1.83.0)
+    aws-sdk-s3 (1.87.0)
       aws-sdk-core (~> 3, >= 3.109.0)
       aws-sdk-kms (~> 1)
       aws-sigv4 (~> 1.1)
     aws-sigv4 (1.2.2)
       aws-eventstream (~> 1, >= 1.0.2)
-    cfn-model (0.5.2)
+    cfn-model (0.6.0)
       kwalify (= 0.7.2)
       psych (~> 3)
     diff-lcs (1.3)
-    docile (1.3.2)
+    docile (1.3.5)
     jmespath (1.4.0)
     kwalify (0.7.2)
     lightly (0.3.3)
@@ -47,7 +47,7 @@ GEM
     parallel (1.19.2)
     parser (2.7.2.0)
       ast (~> 2.4.1)
-    psych (3.2.0)
+    psych (3.3.0)
     rainbow (3.0.0)
     rake (13.0.1)
     regexp_parser (1.8.2)
@@ -77,10 +77,12 @@ GEM
     rubocop-ast (1.1.0)
       parser (>= 2.7.1.5)
     ruby-progressbar (1.10.1)
-    simplecov (0.18.5)
+    simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
-    simplecov-html (0.12.2)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.2)
     unicode-display_width (1.7.0)
 
 PLATFORMS
@@ -91,7 +93,7 @@ DEPENDENCIES
   rake
   rspec (~> 3.4)
   rubocop
-  simplecov (~> 0.11)
+  simplecov (~> 0.21)
 
 BUNDLED WITH
    2.1.4

cfn-nag.gemspec

@@ -14,18 +14,18 @@ Gem::Specification.new do |s|
 
   s.require_paths << 'lib'
 
-  s.required_ruby_version = '>= 2.2'
+  s.required_ruby_version = '>= 2.5'
 
   s.add_development_dependency('rake')
   s.add_development_dependency('rspec', '~> 3.4')
   s.add_development_dependency('rubocop')
-  s.add_development_dependency('simplecov', '~> 0.11')
+  s.add_development_dependency('simplecov', '~> 0.21')
 
   # don't relax this, i don't want different versions of cfn-model being installed after the fact
   # versus what we used to run tests in cfn-nag before publishing cfn-nag
   # they are coupled and we are doing a good bit of experimenting in cfn-model
   # i might consider collapsing them again....
-  s.add_runtime_dependency('cfn-model', '0.5.4')
+  s.add_runtime_dependency('cfn-model', '0.6.0')
   s.add_runtime_dependency('logging', '~> 2.2.2')
   s.add_runtime_dependency('netaddr', '~> 2.0.4')
   s.add_runtime_dependency('optimist', '~> 3.0.0')

scripts/publish.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -ex
 set -o pipefail
-export minor_version="0.6"
+export minor_version="0.7"
 
 set +x
 if [[ -z ${rubygems_api_key} ]];