fix: URL escape file paths in index of generated markdown

Author: bethesque

lib/pact/doc/markdown/index_renderer.rb

@@ -1,3 +1,5 @@
+require 'erb'
+
 module Pact
   module Doc
     module Markdown
@@ -32,7 +34,7 @@ def title
         end
 
         def item title, file_name
-          "* [#{title}](#{file_name})"
+          "* [#{title}](#{ERB::Util.url_encode(file_name)})"
         end
 
       end

spec/support/generated_index.md

@@ -1,4 +1,4 @@
 ### Pacts for Some Consumer
 
-* [Some Provider](Some Provider.md)
-* [Some other provider](Some other provider.md)
+* [Some Provider](Some%20Provider.md)
+* [Some other provider](Some%20other%20provider.md)