Pin addressable to maintain ruby 1.9.3 support (for now)

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     puffing-billy (0.9.2)
-      addressable
+      addressable (~> 2.4.0)
       em-http-request (~> 1.1.0)
       em-synchrony
       eventmachine (~> 1.0.4)
@@ -13,8 +13,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.0)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.4.0)
     builder (3.2.2)
     capybara (2.4.4)
       mime-types (>= 1.16)
@@ -95,7 +94,6 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    public_suffix (2.0.5)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)

puffing-billy.gemspec

@@ -28,7 +28,8 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'pry'
   gem.add_development_dependency 'cucumber'
   gem.add_development_dependency 'watir-webdriver'
-  gem.add_runtime_dependency 'addressable'
+  # addressable 2.5.0 drops support for ruby 1.9.3
+  gem.add_runtime_dependency 'addressable', '~> 2.4.0'
   gem.add_runtime_dependency 'eventmachine', '~> 1.0.4'
   gem.add_runtime_dependency 'em-synchrony'
   gem.add_runtime_dependency 'em-http-request', '~> 1.1.0'