Bump webmock from 1.17.4 to 3.0.1

Bumps [webmock](https://github.com/bblimke/webmock) from 1.17.4 to 3.0.1.
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/commits/v3.0.1)

Gemfile.lock

@@ -124,7 +124,7 @@ GEM
       simplecov (>= 0.7)
       term-ansicolor
       thor
-    crack (0.4.2)
+    crack (0.4.3)
       safe_yaml (~> 1.0.0)
     cucumber (1.3.16)
       builder (>= 2.1.2)
@@ -220,6 +220,7 @@ GEM
       test-unit (~> 2.2)
     haml (4.0.7)
       tilt
+    hashdiff (0.3.4)
     high_voltage (2.1.0)
     hike (1.2.3)
     hitimes (1.2.2)
@@ -466,7 +467,7 @@ GEM
       rspec-expectations (~> 2.14.0)
       rspec-mocks (~> 2.14.0)
     ruby-prof (0.14.2)
-    safe_yaml (1.0.3)
+    safe_yaml (1.0.4)
     sass (3.4.24)
     sass-rails (3.2.6)
       railties (~> 3.2.0)
@@ -549,9 +550,10 @@ GEM
     vcr (2.9.0)
     warden (1.2.3)
       rack (>= 1.0)
-    webmock (1.17.4)
-      addressable (>= 2.2.7)
+    webmock (3.0.1)
+      addressable (>= 2.3.6)
       crack (>= 0.3.2)
+      hashdiff
     xpath (2.0.0)
       nokogiri (~> 1.3)