Update acts-as-taggable-on to 5.0

- only older ruby and activerecord support dropped

Gemfile

@@ -152,7 +152,7 @@ end
 gem 'state_machines-activerecord', '~> 0.4.0'
 # Issue tags
-gem 'acts-as-taggable-on', '~> 4.0'
+gem 'acts-as-taggable-on', '~> 5.0'
 # Background jobs
 gem 'sidekiq', '~> 5.0'

Gemfile.lock

@@ -40,8 +40,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    acts-as-taggable-on (4.0.0)
-      activerecord (>= 4.0)
+    acts-as-taggable-on (5.0.0)
+      activerecord (>= 4.2.8)
     adamantium (0.2.0)
       ice_nine (~> 0.11.0)
       memoizable (~> 0.4.0)
@@ -415,7 +415,7 @@ GEM
       json (~> 1.8)
       multi_xml (>= 0.5.2)
     httpclient (2.8.2)
-    i18n (0.9.1)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
     influxdb (0.2.3)
@@ -933,7 +933,7 @@ GEM
     truncato (0.7.10)
       htmlentities (~> 4.3.1)
       nokogiri (~> 1.8.0, >= 1.7.0)
-    tzinfo (1.2.4)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     u2f (0.2.1)
     uber (0.1.0)
@@ -994,7 +994,7 @@ DEPENDENCIES
   RedCloth (~> 4.3.2)
   ace-rails-ap (~> 4.1.0)
   activerecord_sane_schema_dumper (= 0.2)
-  acts-as-taggable-on (~> 4.0)
+  acts-as-taggable-on (~> 5.0)
   addressable (~> 2.5.2)
   akismet (~> 2.0)
   allocations (~> 1.0)