removing useless spork

Gemfile.lock

@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    i18n-timezones (1.3.7)
+    i18n-timezones (1.4.7)
       i18n (~> 0.9.3)
-      rails (>= 5.1.4)
+      rails (~> 5.1, >= 5.1.4)
 
 GEM
   remote: https://rubygems.org/
@@ -115,7 +115,6 @@ GEM
       rspec-mocks (~> 3.7.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.0)
-    spork (1.0.0rc4)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -135,10 +134,9 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  i18n-spec (>= 0.1.1)
+  i18n-spec (~> 0.1, >= 0.1.1)
   i18n-timezones!
-  rspec-rails (>= 3.7.2)
-  spork (~> 1.0rc)
+  rspec-rails (~> 3.7, >= 3.7.2)
 
 RUBY VERSION
    ruby 2.3.0p0

i18n-timezones.gemspec

@@ -18,11 +18,10 @@ Gem::Specification.new do |s|
   s.test_files = Dir["test/**/*"]
   s.require_path = 'lib'
   s.platform     = Gem::Platform::RUBY
-  s.licenses = ['MIT', 'GPL-2']
+  s.licenses = ['MIT', 'GPL-3.0']
 
   s.add_dependency('i18n', '~> 0.9.3')
-  s.add_dependency "rails", ">= 5.1.4"
-  s.add_development_dependency "rspec-rails", ">= 3.7.2"
-  s.add_development_dependency "i18n-spec", ">= 0.1.1"
-  s.add_development_dependency "spork", "~> 1.0rc"
+  s.add_runtime_dependency 'rails', '~> 5.1', '>= 5.1.4'
+  s.add_development_dependency 'rspec-rails', '~> 3.7', '>= 3.7.2'
+  s.add_development_dependency 'i18n-spec', '~> 0.1', '>= 0.1.1'
 end