Set version to 2.0.0.beta1 and change gemspec dependencies to '>= 2.0…

….0.beta', '< 3' until 2.0.0 is released.

Gemfile

@@ -7,8 +7,6 @@ gem "rdf",            git: "git://github.com/ruby-rdf/rdf.git", branch: "develop
 group :development do
   gem "rdf-spec",       git: "git://github.com/ruby-rdf/rdf-spec.git", branch: "develop"
   gem "rdf-isomorphic", git: "git://github.com/ruby-rdf/rdf-isomorphic.git", branch: "develop"
-  gem "rdf-rdfa",       git: "git://github.com/ruby-rdf/rdf-rdfa.git", branch: "develop"
-  gem "rdf-rdfxml",     git: "git://github.com/ruby-rdf/rdf-rdfxml.git", branch: "develop"
   gem "rdf-xsd",        git: "git://github.com/ruby-rdf/rdf-xsd.git", branch: "develop"
   gem "json-ld",        git: "git://github.com/ruby-rdf/json-ld.git", branch: "develop"
 end

VERSION

@@ -1 +1 @@
-1.99.0
+2.0.0.beta1

rdf-n3.gemspec

@@ -23,14 +23,13 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 2.0.0'
   gem.requirements          = []
 
-  gem.add_dependency             'rdf',             '>= 1.99', '< 3'
+  gem.add_dependency             'rdf',             '>= 2.0.0.beta', '< 3'
   gem.add_development_dependency 'open-uri-cached', '~> 0.0', '>= 0.0.5'
   gem.add_development_dependency 'json-ld',         '>= 1.99', '< 3'
   gem.add_development_dependency 'rspec',           '~> 3.2'
   gem.add_development_dependency 'rspec-its',       '~> 1.0'
-  gem.add_development_dependency 'rdf-spec',        '>= 1.99', '< 3'
-  gem.add_development_dependency 'rdf-rdfxml',      '>= 1.99', '< 3'
-  gem.add_development_dependency 'rdf-isomorphic',  '>= 1.99', '< 3'
+  gem.add_development_dependency 'rdf-spec',        '>= 2.0.0.beta', '< 3'
+  gem.add_development_dependency 'rdf-isomorphic',  '>= 2.0.0.beta', '< 3'
   gem.add_development_dependency 'yard' ,           '~> 0.8'
 
   gem.post_install_message  = nil