Add new line for all Ruby Solutions from 001 to 020

Author: MarkKuang1991

solution/001.Two Sum/Solution.rb

@@ -8,4 +8,4 @@ def two_sum(nums, target)
     end
     next
   end
-end
+end

solution/002.Add Two Numbers/Solution.rb

@@ -34,4 +34,4 @@ def add_two_numbers(l1, l2)
   end
 
   l3
-end
+end

solution/007.Reverse Integer/Solution.rb

@@ -18,4 +18,4 @@ def reverse(x)
   # have to explicitly constraint the int boundary as per the dummy test case
   res = s.to_i
   res <= 214_748_364_7 && res >= -214_748_364_8 ? res : 0
-end
+end

solution/013.Roman to Integer/Solution.rb

@@ -29,4 +29,4 @@ def roman_to_int(s)
   end
 
   res
-end
+end

solution/014.Longest Common Prefix/Solution.rb

@@ -22,4 +22,4 @@ def longest_common_prefix(strs)
   end
 
   idx > 0 ? strs[0][0..idx] : ''
-end
+end

solution/015.3Sum/Solution.rb

@@ -25,4 +25,4 @@ def three_sum(nums)
   end
 
   res
-end
+end

solution/019.Remove Nth Node From End of List/Solution.rb

@@ -24,4 +24,4 @@ def remove_nth_from_end(head, n)
   return head.next if count == n
   s.next = s.next.next
   head
-end
+end

solution/020.Valid Parentheses/Solution.rb

@@ -19,4 +19,4 @@ def is_valid(s)
     end
   end
   stack == ''
-end
+end