Add support for Clojure 1.10 and "master" (#990)

Add support for Clojure 1.10 and "master"

Author: jmerle

lib/docs/scrapers/clojure.rb

@@ -13,18 +13,23 @@ class Clojure < UrlScraper
       Licensed under the Eclipse Public License 1.0.
     HTML
 
-    version '1.9' do
-      self.release = '1.9'
+    version '1.10' do
+      self.release = '1.10 (stable)'
       self.base_url = 'https://clojure.github.io/clojure/'
     end
 
+    version '1.9' do
+      self.release = '1.9 (legacy)'
+      self.base_url = 'https://clojure.github.io/clojure/branch-clojure-1.9.0/'
+    end
+
     version '1.8' do
-      self.release = '1.8'
+      self.release = '1.8 (legacy)'
       self.base_url = 'https://clojure.github.io/clojure/branch-clojure-1.8.0/'
     end
 
     version '1.7' do
-      self.release = '1.7'
+      self.release = '1.7 (legacy)'
       self.base_url = 'https://clojure.github.io/clojure/branch-clojure-1.7.0/'
     end