Lock sqlite3 to ~> 1.3.6

There is a gem requirement issue with Active Record adapter, up until
5.2.2.

Author: sikachu

activerecord-session_store.gemspec

@@ -26,5 +26,4 @@ Gem::Specification.new do |s|
   s.add_dependency('multi_json', '~> 1.11', '>= 1.11.2')
 
   s.add_development_dependency('sqlite3')
-  s.add_development_dependency('appraisal', '~> 2.1.0')
 end

gemfiles/rails_4.0.gemfile

@@ -5,5 +5,6 @@ gem "actionpack", "~> 4.0.0"
 gem "activerecord", "~> 4.0.0"
 gem "railties", "~> 4.0.0"
 gem 'nokogiri', "~> #{nokogiri_ver}.0"
+gem "sqlite3", "~> 1.3.6"
 
 gemspec :path => "../"

gemfiles/rails_4.1.gemfile

@@ -5,5 +5,6 @@ gem "actionpack", "~> 4.1.0"
 gem "activerecord", "~> 4.1.0"
 gem "railties", "~> 4.1.0"
 gem 'nokogiri', "~> #{nokogiri_ver}.0"
+gem "sqlite3", "~> 1.3.6"
 
 gemspec :path => "../"

gemfiles/rails_4.2.gemfile

@@ -5,5 +5,6 @@ gem "actionpack", "~> 4.2.0"
 gem "activerecord", "~> 4.2.0"
 gem "railties", "~> 4.2.0"
 gem 'nokogiri', "~> #{nokogiri_ver}.0"
+gem "sqlite3", "~> 1.3.6"
 
 gemspec :path => "../"

gemfiles/rails_5.0.gemfile

@@ -3,5 +3,6 @@ source "https://rubygems.org"
 gem "actionpack", "~> 5.0.0"
 gem "activerecord", "~> 5.0.0"
 gem "railties", "~> 5.0.0"
+gem "sqlite3", "~> 1.3.6"
 
 gemspec :path => "../"

gemfiles/rails_5.1.gemfile

@@ -3,5 +3,6 @@ source "https://rubygems.org"
 gem "actionpack", "~> 5.1.0"
 gem "activerecord", "~> 5.1.0"
 gem "railties", "~> 5.1.0"
+gem "sqlite3", "~> 1.3.6"
 
 gemspec :path => "../"