Update rqrcode requirement from ~> 2.1.0 to >= 2.1, < 2.3

Updates the requirements on [rqrcode](https://github.com/whomwah/rqrcode) to permit the latest version.
- [Release notes](https://github.com/whomwah/rqrcode/releases)
- [Changelog](https://github.com/whomwah/rqrcode/blob/master/CHANGELOG.md)
- [Commits](whomwah/rqrcode@v2.1.2...v2.2.0)

---
updated-dependencies:
- dependency-name: rqrcode
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -8,7 +8,7 @@ PATH
       nokogiri (>= 1.8)
       prawn (~> 2.4.0)
       prawn-table (= 0.2.2)
-      rqrcode (~> 2.1.0)
+      rqrcode (>= 2.1, < 2.3)
 
 GEM
   remote: https://rubygems.org/
@@ -106,7 +106,7 @@ GEM
       ffi (~> 1.0)
     regexp_parser (2.1.1)
     rexml (3.2.5)
-    rqrcode (2.1.2)
+    rqrcode (2.2.0)
       chunky_png (~> 1.0)
       rqrcode_core (~> 1.0)
     rqrcode_core (1.2.0)

br_danfe.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'nokogiri', '>= 1.8'
   spec.add_dependency 'prawn', '~> 2.4.0'
   spec.add_dependency 'prawn-table', '0.2.2'
-  spec.add_dependency 'rqrcode', '~> 2.1.0'
+  spec.add_dependency 'rqrcode', '>= 2.1', '< 2.3'
 
   spec.add_development_dependency 'byebug', '11.1.3'
   spec.add_development_dependency 'guard', '~> 2.18.1'