Remove the fixed version for guard-livereload

Gemfile

@@ -133,7 +133,7 @@ group :test do
   gem 'timecop'
   gem 'guard'
   gem 'guard-rspec', require: false
-  gem 'guard-livereload', '~> 2.4', require: false
+  gem 'guard-livereload', require: false
   gem 'vcr'
   gem 'rails-controller-testing'
 end

Gemfile.lock

@@ -195,7 +195,7 @@ GEM
     erubis (2.7.0)
     ethon (0.11.0)
       ffi (>= 1.3.0)
-    eventmachine (1.2.5)
+    eventmachine (1.2.7)
     excon (0.60.0)
     execjs (2.7.0)
     factory_bot (4.8.2)
@@ -458,7 +458,7 @@ GEM
     loofah (2.2.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    lumberjack (1.0.12)
+    lumberjack (1.0.13)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
     mailjet (1.5.4)
@@ -811,7 +811,7 @@ DEPENDENCIES
   fog-openstack
   font-awesome-rails
   guard
-  guard-livereload (~> 2.4)
+  guard-livereload
   guard-rspec
   haml-lint
   haml-rails