Merge pull request youngyangyang04#1177 from xuerbujia/master

添加（0141.环形链表.md）和 添加（0189.轮转数组.md）：增加go版本

Author: youngyangyang04

problems/0141.环形链表.md

@@ -106,6 +106,21 @@ class Solution:
 ## Go
 
 ```go
+func hasCycle(head *ListNode) bool {
+    if head==nil{
+        return false
+    } //空链表一定不会有环
+    fast:=head
+    slow:=head //快慢指针
+    for fast.Next!=nil&&fast.Next.Next!=nil{
+        fast=fast.Next.Next
+        slow=slow.Next
+        if fast==slow{
+            return true  //快慢指针相遇则有环
+        }
+    }
+    return false
+}
 ```
 
 ### JavaScript

problems/0189.旋转数组.md

@@ -124,6 +124,19 @@ class Solution:
 ## Go
 
 ```go
+func rotate(nums []int, k int)  {
+    l:=len(nums)
+    index:=l-k%l
+    reverse(nums)
+    reverse(nums[:l-index])
+    reverse(nums[l-index:])
+}
+func reverse(nums []int){
+    l:=len(nums)
+    for i:=0;i<l/2;i++{
+        nums[i],nums[l-1-i]=nums[l-1-i],nums[i]
+    }
+}
 ```
 
 ## JavaScript