Remove wirble from Gemfile, as dependency-ci objects that it has no license and it's not really neccessary.

Author: gkellogg

.travis.yml

@@ -6,7 +6,7 @@ env:
 rvm:
   - 2.2.5
   - 2.3.1
-  - jruby-9.0.5.0
+  - jruby-9.1.2.0
   - rbx
 cache: bundler
 sudo: false

Gemfile

@@ -5,10 +5,6 @@ gemspec
 gem 'rdf',            github: "ruby-rdf/rdf",             branch: "develop"
 gem 'rdf-isomorphic', github: "ruby-rdf/rdf-isomorphic",  branch: "develop"
 
-group :development do
-  gem "wirble"
-end
-
 group :debug do
   gem "byebug", platform: :mri
 end