Add a heuristic to disambiguate SubRip text files

lib/linguist/heuristics.rb

@@ -391,6 +391,12 @@ module Linguist
       end
     end
     
+    disambiguate ".srt" do |data|
+      if /^(\d{2}:\d{2}:\d{2},\d{3})\s*(-->)\s*(\d{2}:\d{2}:\d{2},\d{3})$/.match(data)
+        Language["SubRip Text"]
+      end
+    end
+    
     disambiguate ".t" do |data|
       if /^\s*%|^\s*var\s+\w+\s*:\s*\w+/.match(data)
         Language["Turing"]