Change jquery-rails dependency

This basically reverts c43c76a as the
dependency enforces a Rails app to stay at a lower version of
jquery-rails and this is not required at all.

README.md

@@ -7,7 +7,7 @@ This ruby gem provides the latest version of [lightbox2](https://github.com/loke
 Require this Ruby gem in your Ruby on Rails app by adding the following line to your `Gemfile`:
 
 ```
-gem 'lightbox2', '~> 2.10.0'
+gem 'lightbox2'
 ```
 
 Install the ruby gem by running `bundle` in your Rails app directory.

lib/lightbox2/rails/version.rb

@@ -1,6 +1,6 @@
 module Lightbox2
   module Rails
-    VERSION = '2.10.0.1'
+    VERSION = '2.10.0.2'
     LIGHTBOX2_VERSION = '2.10.0'
   end
 end

lightbox2.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name        = 'lightbox2'
-  s.version     = '2.10.0.1'
-  s.date        = '2019-03-11'
+  s.version     = '2.10.0.2'
+  s.date        = '2019-03-12'
   s.summary     = 'lightbox2 for Ruby on Rails'
   s.description = "This gem for Ruby on Rails provides the lightbox2 library to Rails\'s asset pipeline."
   s.authors     = ['Manuel Schnitzer']
@@ -15,5 +15,5 @@ Gem::Specification.new do |s|
     '*.md',
   ]
 
-  s.add_dependency 'jquery-rails', '~> 3.1', '>= 3.1.3'
+  s.add_dependency 'jquery-rails', '>= 3.1.3'
 end