Update uuidtools requirement from ~> 2.2.0 to >= 2.2, < 3.1

---
updated-dependencies:
- dependency-name: uuidtools
  dependency-version: 3.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

publify_core.gemspec

@@ -47,7 +47,7 @@ Gem::Specification.new do |s|
   s.add_dependency "rubypants", "~> 0.7.0"
   s.add_dependency "sassc-rails", "~> 2.0"
   s.add_dependency "twitter", ">= 7.0", "< 8.2"
-  s.add_dependency "uuidtools", "~> 2.2.0"
+  s.add_dependency "uuidtools", ">= 2.2", "< 3.1"
 
   s.add_development_dependency "appraisal", "~> 2.3"
   s.add_development_dependency "capybara", "~> 3.0"