Updated the rule to parse "last <day-of-week> of <time>"

Summary:
current:
last friday in october -> the date of Friday of previous week
expected:
last friday in october -> the data of last Friday of month october

Reviewed By: chinmay87

Differential Revision: D22201326

fbshipit-source-id: 1983c1b9c24aa356977af7def42d5ba07c7f08be

Duckling/Time/EN/Corpus.hs

@@ -1845,6 +1845,10 @@ allExamples = concat
   , examples (datetimeHoliday (2011, 12, 25, 0, 0, 0) Day "Christmas")
             [ "the 3rd closest xmas to today"
             ]
+  , examples (datetime (2013, 10, 25, 0, 0, 0) Day)
+            [ "last friday of october"
+            , "last friday in october"
+            ]
   , examples (datetime (2013, 2, 25, 0, 0, 0) Week)
             [ "upcoming two weeks"
             , "upcoming two week"

Duckling/Time/EN/Rules.hs

@@ -223,7 +223,7 @@ ruleLastDOWOfTime = Rule
   , pattern =
     [ regex "last"
     , Predicate isADayOfWeek
-    , regex "of"
+    , regex "(of|in)"
     , dimension Time
     ]
   , prod = \tokens -> case tokens of