fix: replace backslashes in pact dir path with forward slashes

Closes: pact-foundation/pact-js#150

lib/pact/consumer_contract/file_name.rb

@@ -8,11 +8,15 @@ def file_name consumer_name, provider_name, options = {}
     end
 
     def file_path consumer_name, provider_name, pact_dir = Pact.configuration.pact_dir, options = {}
-      File.join(pact_dir, file_name(consumer_name, provider_name, options))
+      File.join(windows_safe(pact_dir), file_name(consumer_name, provider_name, options))
     end
 
     def filenamify name
       name.downcase.gsub(/\s/, '_')
     end
+
+    def windows_safe(pact_dir)
+      pact_dir.gsub("\\", "/")
+    end
   end
 end

spec/lib/pact/consumer_contract/file_name_spec.rb

@@ -3,13 +3,22 @@
 module Pact
   describe FileName do
     describe "file_path" do
-      let(:subject) { FileName.file_path 'foo', 'bar', 'tmp/pacts' }
+
+      subject { FileName.file_path 'foo', 'bar', 'tmp/pacts' }
       it { is_expected.to eq 'tmp/pacts/foo-bar.json' }
 
       context "when unique is true" do
-        let(:subject) { FileName.file_path 'foo', 'bar', 'tmp/pacts', unique: true }
+        subject { FileName.file_path 'foo', 'bar', 'tmp/pacts', unique: true }
         it { is_expected.to match %r{tmp/pacts/foo-bar-\d+.json} }
       end
+
+      context "when the path includes backslashes" do
+        subject { FileName.file_path 'foo', 'bar', 'c:\tmp\pacts' }
+
+        it "changes them to forward slashes" do
+          expect(subject).to eq "c:/tmp/pacts/foo-bar.json"
+        end
+      end
     end
   end
 end