Fix Could not find gem 'active_support (>= 0) ruby'

Gemfile

@@ -4,4 +4,4 @@ gemspec
 # For test OCR
 gem 'rtesseract'
 gem 'mini_magick'
-gem 'active_support'
+gem 'activesupport'

Gemfile.lock

@@ -1,15 +1,24 @@
 PATH
   remote: .
   specs:
-    rucaptcha (0.1.3)
+    rucaptcha (0.1.4)
       posix-spawn (>= 0.3.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
+    activesupport (4.2.4)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
     diff-lcs (1.2.5)
+    i18n (0.7.0)
+    json (1.8.3)
     mini_magick (4.3.6)
     mini_portile (0.6.2)
+    minitest (5.8.2)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     posix-spawn (0.3.11)
@@ -29,11 +38,15 @@ GEM
     rspec-support (3.3.0)
     rtesseract (1.3.1)
       nokogiri
+    thread_safe (0.3.5)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  activesupport
   mini_magick
   rake
   rspec (>= 3.3.0)