Update pandas documentation (0.22.0)

Author: Thibaut

lib/docs/scrapers/pandas.rb

@@ -20,6 +20,11 @@ class Pandas < UrlScraper
       Licensed under the 3-clause BSD License.
     HTML
 
+    version '0.22' do
+      self.release = '0.22.0'
+      self.base_url = "http://pandas.pydata.org/pandas-docs/version/#{self.release}/"
+    end
+
     version '0.21' do
       self.release = '0.21.0'
       self.base_url = "http://pandas.pydata.org/pandas-docs/version/#{self.release}/"