Fix hindi test and schemes (#24)

* test: Fix hindi test cases

According to the current hindi scheme
and mainstream usage:
taa corresponds to ता
tha corresponds to था

* schemes: Remove duplicated "y" key in hindi schemes

This removes warning messages while building hindi schemes

Author: suraj-sloth

schemes/hi/hi.scheme

@@ -69,7 +69,6 @@ consonants "k" => "क",
            ["N"] => "ण",
            ["dh"] => "ध",
            ["n"] => "न",                   
-           "y" => "य",
            "r" => ["र", "र#{$virama}"],
            "l" => ["ल", "ल#{$virama}"],
            ["v", "w"] => "व",

test/hi.rb

@@ -8,8 +8,8 @@ def setup
 
   def test_words
     list = {
-      'kithaab' => 'किताब',
-      'pithaa' => 'पिता'
+      'kitaab' => 'किताब',
+      'pitaa' => 'पिता'
     }
     list.each do |pattern, expected|
       # TODO assert length of result array too