Upgrade image_optim.

Gemfile

@@ -66,10 +66,7 @@ gem 'unf', require: false
 
 gem 'email_reply_trimmer', '0.1.6'
 
-# note: for image_optim to correctly work you need to follow
-# https://github.com/toy/image_optim
-# pinned due to https://github.com/toy/image_optim/pull/75, docker image must be upgraded to upgrade
-gem 'image_optim', '0.20.2'
+gem 'image_optim'
 gem 'multi_json'
 gem 'mustache'
 gem 'nokogiri'

Gemfile.lock

@@ -95,7 +95,7 @@ GEM
     erubis (2.7.0)
     excon (0.53.0)
     execjs (2.7.0)
-    exifr (1.2.4)
+    exifr (1.2.5)
     fabrication (2.9.8)
     fakeweb (1.3.0)
     faraday (0.11.0)
@@ -109,7 +109,7 @@ GEM
     flamegraph (0.9.5)
     foreman (0.82.0)
       thor (~> 0.19.1)
-    fspath (2.1.1)
+    fspath (3.1.0)
     gc_tracer (1.5.1)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
@@ -122,14 +122,14 @@ GEM
       domain_name (~> 0.5)
     http_accept_language (2.0.5)
     i18n (0.7.0)
-    image_optim (0.20.2)
-      exifr (~> 1.1, >= 1.1.3)
-      fspath (~> 2.1)
-      image_size (~> 1.3)
+    image_optim (0.24.2)
+      exifr (~> 1.2, >= 1.2.2)
+      fspath (~> 3.0)
+      image_size (~> 1.5)
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
-    image_size (1.4.1)
-    in_threads (1.3.1)
+    image_size (1.5.0)
+    in_threads (1.4.0)
     jmespath (1.3.1)
     jquery-rails (4.2.1)
       rails-dom-testing (>= 1, < 3)
@@ -218,7 +218,7 @@ GEM
       redis
       ruby-openid
     pg (0.19.0)
-    progress (3.1.1)
+    progress (3.3.1)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
@@ -412,7 +412,7 @@ DEPENDENCIES
   hiredis
   htmlentities
   http_accept_language (~> 2.0.5)
-  image_optim (= 0.20.2)
+  image_optim
   listen (= 0.7.3)
   logster
   lru_redux