upgrade ruby and some gems

.ruby-version

@@ -1 +1 @@
-2.1.3
+2.5.1

black_book.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "json"
-  spec.add_dependency "rest-client", "~> 1.7"
+  spec.add_dependency "rest-client", "~> 2.0"
   spec.add_dependency "symboltable", "~> 1.0"
 
   spec.add_development_dependency "awesome_print", "~> 1.2"
@@ -29,6 +29,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "pry-nav", "~> 0.2"
   spec.add_development_dependency "rake", "~> 10.3"
   spec.add_development_dependency "rspec", "~> 3.1"
-  spec.add_development_dependency "vcr", "~> 2.9"
-  spec.add_development_dependency "webmock", "~> 1.10"
+  spec.add_development_dependency "vcr", "~> 4.0"
+  spec.add_development_dependency "webmock", "~> 3.5"
 end

spec/base_request_spec.rb

@@ -23,7 +23,7 @@
 
     context "with valid credentials" do
       it "executes the request" do
-        VCR.use_cassette("BaseRequest.request") do
+        VCR.use_cassette("BaseRequest_request") do
           response = subject.request("#{subject.base_url}/UsedVehicle/VIN/2C4RDGBG1CR385500")
           expect(JSON.parse(response)).to have_key("used_vehicles")
         end

spec/used_vehicle_spec.rb

@@ -17,7 +17,7 @@
     end
 
     it "returns a Hash from the response json" do
-      VCR.use_cassette("UsedVehicle.by_vin") do
+      VCR.use_cassette("UsedVehicle_by_vin") do
         response = BlackBook::UsedVehicle.by_vin("2C4RDGBG1CR385500")
         expect(response["used_vehicles"]).not_to be_empty
       end