Make Gemfile read from gemspec

Gemfile

@@ -1,13 +1,3 @@
 source 'https://rubygems.org'
 
-group :development do
-  gem "rspec", ">= 2.8.0"
-  gem 'rspec-rails'
-  gem 'i18n-spec', "~> 0.6.0"
-  gem 'localeapp'
-  gem 'railties'
-  gem 'activemodel'
-  gem 'omniauth-twitter'
-end
-
-gem 'devise', '>= 4.9.0'
+gemspec

Gemfile.lock

@@ -1,3 +1,9 @@
+PATH
+  remote: .
+  specs:
+    devise-i18n (1.12.0)
+      devise (>= 4.9.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -178,7 +184,7 @@ PLATFORMS
 
 DEPENDENCIES
   activemodel
-  devise (>= 4.9.0)
+  devise-i18n!
   i18n-spec (~> 0.6.0)
   localeapp
   omniauth-twitter

devise-i18n.gemspec

@@ -24,7 +24,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency(%q<devise>.freeze, [">= 4.9.0"])
   s.add_development_dependency(%q<rspec>.freeze, [">= 2.8.0"])
   s.add_development_dependency(%q<rspec-rails>.freeze, [">= 0"])
-  s.add_development_dependency(%q<jeweler>.freeze, [">= 0"])
   s.add_development_dependency(%q<i18n-spec>.freeze, ["~> 0.6.0"])
   s.add_development_dependency(%q<localeapp>.freeze, [">= 0"])
   s.add_development_dependency(%q<railties>.freeze, [">= 0"])