Update templates to use Addressable::URI

Ports swagger-api/swagger-codegen#10445.

src/main/resources/ruby-client/client.mustache

@@ -7,7 +7,7 @@ require 'json'
 require 'logger'
 require 'tempfile'
 require 'typhoeus'
-require 'uri'
+require 'addressable/uri'
 
 module {{moduleName}}
  module API
@@ -56,7 +56,7 @@ module {{moduleName}}
  :message => response.return_message)
  else
  fail API::Error.new(:code => response.code,
- :response_headers => response.headers,
+ :response_headers => response.headers.to_h,
  :response_body => response.body),
  response.status_message
  end
@@ -264,7 +264,7 @@ module {{moduleName}}
  def build_request_url(path)
  # Add leading and trailing slashes to path
  path = "/#{path}".gsub(/\/+/, '/')
- URI.encode(@config.base_url + path)
+ Addressable::URI.encode(@config.base_url + path)
  end
 
  # Builds the HTTP request body

src/main/resources/ruby-client/configuration.mustache

@@ -2,7 +2,7 @@
 {{> api_info}}
 =end
 
-require 'uri'
+require 'addressable/uri'
 
 module {{moduleName}}
  module API
@@ -168,7 +168,7 @@ module {{moduleName}}
 
  def base_url
  url = "#{scheme}:https://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
- URI.encode(url)
+ Addressable::URI.encode(url)
  end
 
  # Gets API key (with prefix if set).

src/main/resources/ruby-client/gemspec.mustache

@@ -31,4 +31,5 @@ Gem::Specification.new do |s|
 
  s.add_runtime_dependency 'typhoeus', '~> 1.0', '>= 1.0.1'
  s.add_runtime_dependency 'json', '~> 2.1', '>= 2.1.0'
+ s.add_runtime_dependency 'addressable', '~> 2.3', '>= 2.3.0'
 end